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Pulsating Torque Suppression of Flux Reversal Machines Based on Specific Harmonic Contributions of Rotor Permeance and PM MMF

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IEEE Transactions on Industry Applications 2025年

作者： Li, Junzhou Gao, Yuting Zhang, Chaofeng Zha, Xiaoming Qu, Ronghai Wuhan University School of Electrical Engineering and Automation Wuhan430072 China Key Laboratory of Integrated Energy Power Equipment and System Security Hubei430206 China State Grid Henan Electric Power Research Institute Zhengzhou450052 China Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

Flux reversal machines (FRMs) exhibit high torque density, but also significant pulsating torque, including cogging torque and torque ripple. Traditional methods fail to separate the harmonics that affect torque density and pulsating torque, leading to a degradation of torque density when reducing pulsating torque. Therefore, to maintain torque density and simultaneously reduce pulsating torque, this paper proposes a novel FRM configuration incorporating shape designs for the rotor and permanent magnets (PMs). First, the key generation mechanisms of cogging torque, average torque, and torque ripple are thoroughly examined, with analytical expressions derived to classify the torque contributions of all air-gap magnetic field harmonics into negative-effect and positive-effect components. Further, the rotor and PM shapes are designed to enhance the positive-effect components and reduce the negative-effect ones of the air-gap permeance and magnetomotive force (MMF). The impacts of geometric parameters are evaluated by using a sensitivity-based hierarchical optimization approach. Then, the proposed FRM is comprehensively compared with a conventional FRM in terms of back-electromotive force (EMF), cogging torque, average torque, torque ripple, efficiency, etc. The results indicate that the proposed machine configuration achieves reductions in cogging torque and torque ripple by 90% and 86.8%, respectively, while maintaining consistent average torque. Finally, a 12-slot/10-pole FRM prototype was built and tested to validate the effectiveness of the proposed machine topology. © 1972-2012 IEEE.

关键词： Permanent magnets

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Interfacial modification enhancing corrosion resistance of boron nitride nanosheets/Al matrix composites

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Journal of Materials science & technology 2026年 240卷 98-113页

作者： Ancang Yang Lishi Ma Yonghua Duan Xudong Rong Yimin Zhang Lin Zhu Shanju Zheng Mingjun Peng Mengnie Li Faculty of Material Science and Engineering Yunnan Key Laboratory of Integrated Computational Materials Engineering for Advanced Light Alloys Kunming University of Science and Technology Kunming 650093 China School of Materials Science and Engineering Tianjin Key Laboratory of Composite and Functional Materials Tianjin University Tianjin 300350 China National Key Laboratory of Nuclear Fuel and Material Nuclear Power Institute of China Chengdu 610041 China

The difference in electrochemical behavior between reinforcement and metal matrix usually damages the corrosion resistance of composites. Herein, the coherent BNNSs-AlN-Al transition interface is creatively constructed in the Aluminium-Boron nitride nanosheets (Al-BNNSs) system based on reactive sintering. It is demonstrated that BNNSs/Al composites exhibit good corrosion resistance via interfacial modification. The BNNSs-AlN-Al transition interface not only optimizes the interfacial structure of BNNSs/Al composites but also significantly enhances the interface bonding strength. Many low-angle grain boundaries (LAGBs) are induced during extrusion due to the pinning effect of strong bonding transition interface. Besides, density functional theory (DFT) calculation and geometric phase analysis (GPA) were executed to clarify the influence of interface design on the corrosion behavior of BNNSs/Al composites. It is found that the transition interface and LAGBs have strong valence electron constraint ability, thus weakening the galvanic effect in composites. Also, the construction of the transition interface reduces the geometrically necessary dislocations and lattice distortion in the grains of Al matrix, avoiding the decrease of corrosion potential of Al matrix. Ultimately, the coupling effect between LAGB and transition interface not only significantly enhances the ion erosion resistance of composites, but also shifts the corrosion mechanism from intergranular corrosion (IGC) to pitting corrosion (PC) in Al matrix. The current work provides a feasible route for the design of aluminum matrix composites (AMCs) with high corrosion resistance.

关键词： BNNSs/Al composites Coherent transition interface Corrosion potential Corrosion resistance

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3D printing of high-performance micro-supercapacitors with patterned exfoliated graphene/carbon nanotube/silver nanowire electrodes

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science China(Technological sciences) 2021年第5期64卷 1065-1073页

作者： LIU Lang LU JunYong LONG XinLin ZHOU Ren LIU YingQuan WU YiTing YAN KangWei National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033China

Micro-supercapacitors(MSCs)show great potential as on-chip energy storage devices for portable *** major flaw of thin-film MSCs is their low energy *** improve the energy density,thicker electrodes are ***,the fabrication of MSCs with thick electrodes remains a *** this work,a novel 3D printing method is employed to fabricate high-performance MSCs with interdigitated exfoliated graphene(EG)/carbon nanotube(CNT)/silver nanowire(Ag NW)*** nanowelding of Ag NW junction plays a critical role in the realization of 3D *** enhance the electrochemical performances of EG,phosphorus atoms are incorporated into the carbon framework with 1.7 at%.The areal capacitance of the 3D printed MSC is 21.6 mF cm^(-2)at a scan rate of 0.01 V s^(-1).The areal energy density of the MSC ranges from 0.5 to 2μWh cm^(-2)with a maximum power density of 2.5 mW cm^(-2).

关键词： micro-supercapacitor 3D printing silver nanowire exfoliated graphene micro-plasma-jet

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Delamination failure analysis of G10 insulator in electromagnetic rail launcher

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High Voltage 2023年第5期8卷 889-897页

作者： Xinkai Hu Junyong Lu Sai Tan Bai Li Jiawei Zhang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhanHubeiChina

The electromagnetic(EM)rail launcher G10 insulator is prone to delamination damage during launch,which affects the service life of the *** the secondary development of ABAQUS®commercial finite‐element software,an EM‐structure coupling launch dynamics model considering projectile‐barrel coupling is *** simulation indicates that the transverse swing of the projectile changes in a sine‐like law,and the time of the upper half wave corresponds to the pulse width of the impact force pulse *** stress concentration occurs on the inner surface of the insulator where the contact‐impact occurs,resulting in impact *** midline of the insulator inner surface bears a large compressive strain under the action of pre‐tightening force,and the insulator is compressed oscillatingly under the influence of the timevarying load of the rail during *** the condition of repeated launch,the launch package repeatedly impacts the insulator,and the alternating load of the rail is cyclically loaded on the insulator with impact damage,which will cause the compression fatigue of the insulator and the expansion of impact damage *** are the main reasons for the delamination failure of insulator,and the experimental analysis is carried *** study provides a method to study the delamination failure mechanism of the insulator,and provides guidance for improving the life of the insulator.

关键词： insulator damage analysis

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Dynamic State Estimation of Medium-voltage DC integrated power system with Pulse Load

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Journal of Modern power systems and Clean Energy 2020年第4期8卷 689-698页

作者： Runlong Xiao Gang Wang Xiaoliang Hao Renji Huang Youxing Xiong National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033China

The dynamic characteristic evaluation is an important prerequisite for safe and reliable operation of the mediumvoltage DC integrated power system(MIPS),and the dynamic state estimation is an essential technical approach to the *** the electromechanical transient process in a traditional power system,periodic change in pulse load of the MIPS is an electromagnetic transient *** the system state suddenly changes in the range of a smaller time constant,it is difficult to estimate the dynamic state due to periodic *** paper presents a dynamic mathematical model of the MIPS according to the network structure and control strategy,thereby overcoming the restrictions of algebraic variables on the estimation and developing a dynamic state estimation method based on the extended Kalman *** the method of adding fictitious process noise,it is possible to solve the problem that the linearized algorithm of the MIPS model is less reliable when an abrupt change occurs in the pulse ***,the accuracy of the dynamic state estimation and the stability of the filter can be improved under the periodic disturbance of pulse *** simulation and experimental results confirm that the proposed model and method are feasible and effective.

关键词： Medium-voltage DC integrated power system pulse load dynamic state estimation extended Kalman filter fictitious process noise

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Smart VOCs recognition system based on single gas sensor and multi-task deep learning model

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Sensors and Actuators B: Chemical 2025年 439卷

作者： Mei, Haixia Peng, Jingyi Wang, Tao Zhang, Bowei Xuan, Fuzhen Wang, Lijie Zeng, Min Yang, Zhi Changchun University Changchun130022 China Shanghai Key Laboratory of Intelligent Sensing and Detection Technology School of Mechanical and Power Engineering East China University of Science and Technology Shanghai200237 China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun130012 China National Key Laboratory of Advanced Micro and Nano Manufacture Technology Department of Micro/Nano Electronics School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai200240 China

Electronic nose (E-nose) technology faces key challenges, including cross-sensitivity in gas sensors, high power consumption in multi-sensor arrays, and the need for scalable models. Additionally, robust detection and calibration of abnormal samples are essential for practical sensor applications. Looking forward, achieving cost-effectiveness, long-term stability, and enhanced selectivity and sensitivity of metal oxide semiconductor gas sensors is crucial for E-nose commercialization. In this study, a temperature modulation technique is employed to capture the response from a single MEMS sensor to 10 volatile organic compounds, achieving an average gas identification accuracy of 98.38 % using a convolutional neural network. Transfer learning was also applied to determine gas concentrations, achieving an average accuracy of 88.65 %. To address the interference from the sensor itself or environmental factors, an autoencoder was trained to detect and compensate for anomalies, relying exclusively on features from normal samples and thereby minimizing the need for dedicated abnormal datasets. Anomaly detection accuracy reached 99.00 %. Overall, this research provides valuable insights toward developing low-power, multitasking, high-performance E-nose technology, advancing its potential for real-world applications. © 2025

关键词： Volatile organic compounds

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Dielectric breakdown properties of Al-air mixtures

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Plasma science and technology 2021年第5期23卷 59-65页

作者： Xiyuan CAI Xiao ZHANG Junyong LU Sai TAN Yongsheng ZHANG Guanxiang ZHANG National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033People's Republic of China

In order to investigate the influence of aluminum vapor on the breakdown performance of air,this paper makes a study of the dielectric breakdown characteristics of Al-air mixture in the temperature range of 300-5000 K at atmospheric pressure.A Boltzmann analysis method is used to deal with the electron energy distribution function(EEDF),the reduced ionization coefficients(α/N),the reduced attachment coefficients(η/N)and the critical reduced breakdown strength((E/N)cr)so as to explore the influence of temperature and mixing ratio on the dielectric breakdown *** the temperature range of 300-2000 K,the property of the mixture is mainly determined by the mixing proportion of aluminum vapor because the composition of particles remains *** the temperature range of 2000-2500 K,the decomposition of Al2O_(2)leads to the increase of aluminum oxides and NO,and a rise in the percentage of highenergy electrons as well as the increment ofα/***,the joint action of O_(2)and NO makesη/N increase first and then decrease,and(E/N)crgoes down to a smaller temperature *** increase in the proportion of aluminum vapor causes(E/N)crto decrease in the low-temperature region and to increase in the high-temperature region,which will reduce the transition between these two temperature regions.

关键词： aluminum vapor arc discharges Boltzmann analysis dielectric properties electromagnetic rail launch muzzle arc

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Research on active arc-ignition technology as a possible residual-energy-release strategy in electromagnetic rail launch

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Plasma science and technology 2021年第8期23卷 167-174页

作者： Xiyuan CAI Sai TAN Junyong LU Xiao ZHANG Yun GUO National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan 430033People's Republic of China

In order to solve the problem of the original residual energy release strategy being unsuitable for high-energy and fast-firing electromagnetic rail launch,this work has explored the applicability of active arc-ignition technology(AAT).The results obtained from the comparison of launching experiments show that AAT has no influence on the acceleration of the armature and is capable of quickly releasing the residual *** on the theory of magnetohydrodynamics,this work has also made numerical simulation of the muzzle arc,analyzed the influence of AAT on the muzzle arc flow field,electromagnetic(EM)field and temperature field,and evaluated the performance of AAT according to the projectile initial disturbance,the EM impact on guidance devices and the rail *** results show that AAT is now one of the most practicable strategies for residual energy release.

关键词： muzzle arc initial disturbance guidance device arc ablation backflow

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Theoretical model of lithium iron phosphate power battery under high-rate discharging for electromagnetic launch

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International Journal of Mechanical system Dynamics 2021年第2期1卷 220-229页

作者： Ren Zhou Junyong Lu Xinlin Long Yiting Wu Lang Liu Yingquan Liu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhanChina

Due to the large error of the traditional battery theoretical model during large-rate discharge for electromagnetic launch,the Shepherd derivative model considering the factors of the pulse cycle condition,temperature,and life is proposed by the Naval University of *** discharge rate of traditional lithium-ion batteries does not exceed 10C,while that for electromagnetic launch reaches *** continuous pulse cycle condition of ultra-large discharging rate causes many unique electrochemical reactions inside the *** traditional model cannot accurately describe the discharge characteristics of the *** accurate battery theoretical model is an important basis for system efficiency calculation,precise discharge control,and remaining capacity *** this purpose,an experimental platform for electromagnetic launch is built,and discharge characteristics of the battery under different rate,temperature,and life decay are *** the experimental test and analysis,the reason that the traditional model cannot accurately characterize the large-rate discharge process is *** a novel battery theoretical model is designed with the help of genetic algorithm,which is integrated with the electromagnetic launch *** simulation is compared with the experimental results,which verifies the modeling accuracy for the large-rate *** this basis,a variety of discharge conditions are applied to test the applicability of the model,resulting in better ***,with the continuous cycle-pulse condition in the electromagnetic launch system,the stability and accuracy of the model are confirmed.

关键词： battery model electromagnetic launch large-rate discharge lithium iron phosphate battery

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Failure Analysis of power Electronic Devices and Their Applications under Extreme Conditions

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Chinese Journal of Electrical Engineering 2016年第1期2卷 91-100页

作者： Yifei Luo Fei Xiao Bo Wang Binli Liu National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of EngineeringWuhan430033China

power electronic devices are the core components of modern power converters,not only for normal applications,but also for extreme *** design of power electronic devices require large redundancies for *** results in huge volume and weight for a large-capacity power converter,especially for some extreme ***,to optimize the power density,the reliability of power devices needs to be investigated first in order to obtain the accurate operational margin of a power *** much research on device failure analysis has been reported,there still lacks efficient failure evaluation *** paper first summarizes the current failure ***,a three-step failure analysis method of power electronic devices is proposed as:failure information collection,failure identification and mechanism,and failure *** physics-based modeling method is emphasized since it has a strong relationship with the device *** that,power electronic device applications under extreme conditions are introduced and a design method of device under extreme conditions is proposed based on the thermal equilibrium ***,the challenges and prospects to improve the power device reliability under extreme conditions are concluded.

关键词： power electronic device failure mechanism failure evaluation physics-based modeling extreme conditions thermal equilibrium

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