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| 1 | Model Predictive Current Control with Adaptive-adjusting Timescales for PMSMs显示文摘A model predictive current control(MPCC)with adaptive-adjusting method of timescales for permanent magnet synchronous motors(PMSMs)is proposed in this paper to improve the dynamic response and prediction accuracy in transient-state,while lessening the computational burden and improving the control performance in steady-state.The timescale characteristics of different parts of MPCC,such as signal sampling,prediction calculation,control output,model error correction,are analyzed,and the algorithm architecture of MPCC with multi-timescale is proposed.The difference between reference and actual speed,and the change rate of actual speed are utilized to discriminate the transient state of speed change and load change,respectively.Adaptive-adjusting method of control period and prediction stepsize are illustrated in detail after operation condition discrimination.Experimental results of a PMSM are presented to validate the effectiveness of proposed MPCC.In addition,comparative evaluation of single-step MPCC with fixed timescale and proposed MPCC is conducted,which demonstrates the superiority of proposed control strategy. | Feng Niu Xi Chen Shaopo Huang Xiaoyan Huang Lijian Wu Kui Li Youtong Fang | 2021 | CES Transactions on Electrical Machines and Systems2021，5，2： | 8 |
| 2 | High strength and high conductivity Cu alloys: A review显示文摘High strength and high conductivity(HSHC) Cu alloys are widely used in many fields,such as high-speed electric railway contact wires and integrated circuit lead frames. Pure Cu is well known to have excellent electrical conductivity but rather low strength. The main concern of HSHC Cu alloys is how to strengthen the alloy efficiently. However,when the Cu alloys are strengthened by a certain method,their electrical conductivity will inevitably decrease to a certain extent. This review introduces the strengthening methods of HSHC Cu alloys. Then the research progress of some typical HSHC Cu alloys such as Cu-Cr-Zr,Cu-Ni-Si,Cu-Ag,Cu-Mg is reviewed according to different alloy systems. Finally,the development trend of HSHC Cu alloys is forecasted. It is pointed out that precipitation and micro-alloying are effective ways to improve the performance of HSHC Cu alloys. At the same time,the production of HSHC Cu alloys also needs to comply with the large-scale,low-cost development trend of industrialization in the future. | YANG HuiYa MA ZiChao LEI ChenHui MENG Liang FANG YouTong LIU JiaBin WANG HongTao | 2020 | Science China(Technological Sciences)2020，63，12： | 7 |
| 3 | Trace bis-(3-sulfopropyl)-disulfide enhanced electrodeposited copper foils显示文摘Smooth and strong copper foils are highly required for the development of printed circuit boards and Li-ion batteries.Adding additives is an efficient and low-cost method to enhance electrodeposited copper foils.Here we chose Bis-(3-sulfopropyl)-disulfide(SPS)as the additive and investigated its concentration on the surface roughness and tensile strength of the electrodeposited copper foils.A copper foil with the smoothest surface(Rz=2.1μm)and the highest tensile strength(~338 MPa)was prepared with1.5 mg/L SPS.The contact angle on the copper foil decreased with the reduction of surface roughness.The enhancing mechanism of the SPS was investigated by scanning electron microscopy and X-ray diffraction.The refined grain and enhanced(220)texture were considered to be the radical reason for the smooth and strong copper foils.The electrochemical results prove the suppressing effect is related to the SPS adsorption. | Lingling Liu Yeqiang Bu Yue Sun Jianfeng Pan Jiabin Liu Jien Ma Lin Qiu Youtong Fang | 2021 | Journal of Materials Science & Technology2021，，15： | 6 |
| 4 | Driving Range Parametric Analysis of Electric Vehicles Driven by Interior Permanent Magnet Motors Considering Driving Cycles显示文摘This paper presents parametric analysis of driving range of electric vehicles driven by V-type interior permanent magnet motors aiming at maximum driving range,i.e.,minimal total energy consumption of the motors over a driving cycle.Influence of design parameters including tooth width,slot depth,split ratio(the ratio of inner diameter to outer diameter of the stator),and V-type magnet angle on the energy consumption of the motors and driving range of electric vehicles over a driving cycle is investigated in detail.The investigation is carried out for two typical driving cycles with different characteristics to represent different conditions:One is high-speed,low-torque cycle-Highway Fuel Economy Test and the other is low-speed,high-torque cycle-Artemis Urban Driving Cycle.It shows that for both driving cycles,the same parameters may have different influence on the energy consumption of the motors,as well as driving range of electric vehicles. | Le Tian Lijian Wu Xiaoyan Huang Youtong Fang | 2019 | CES Transactions on Electrical Machines and Systems2019，3，4： | 4 |
| 5 | Homogeneous arc ablation behaviors of CuCr cathodes improved by chromic oxide显示文摘Cathode ablation is one of the dominant limitations for extending the maximum operating time of arc heaters.In this work,the arc ablation behaviors and mechanisms of commercial CuCr10,CuCr25,and CuCr50 cathodes were investigated for pure copper and pure chromium cathodes.The discharging homogeneity was improved with the increase of chromium content in the cathodes,which was attributed to the formed chromic oxide layer.The CuCr50 cathodes exhibited the lowest ablation rate with a reduction of 27.0%compared to the copper cathodes.The chromic oxide formed in the pit protected the bottom matrix,leading to a homogeneous ablation process.The mechanism for the improved homogeneous ablation behaviors of the CuCr50 cathodes was proposed and featured by the suppression of deep pits and the dispersion of arc foot.Future attention will be focused on designing composite cathodes with an anti-ablation surface layer and a good conductive matrix. | Weimian Guan Jie Yuan Hao Lv Tao Zhu Youtong Fang Jiabin Liu Hongtao Wang Zhihui Li Zhigong Tang Wei Yang | 2021 | Journal of Materials Science & Technology2021，，22： | 3 |
| 6 | The optimization of valve plate cross angle based on the pumping dynamics mode显示文摘 | Ma Jien Fang Youtong Xu Bing | 2010 | Journal of Zhejiang University : Science A2010，11，3： | 1 |
| 7 | Subdomain Model for Predicting Armature Reaction Field of Dual-Stator Consequent-Pole PM Machines Accounting for Tooth-Tips显示文摘This paper presents an exact analytical subdomain model of dual-stator consequent-pole permanent-magnet(DSCPPM)machines accounting for tooth-tips,which can accurately predict the armature reaction field distribution in DSCPPM machines.In the proposed subdomain model,the field domain is composed of four types of sub-regions,viz.magnets,outer/inner air gaps,slots and slot openings.The analytical expressions of vector potential in each sub-region are determined by boundary and interface conditions.In comparison to the analytically predicted results,the corresponding flux density field distributions computed by finite element(FE)method are analyzed,which confirms the excellent accuracy of the developed subdomain model. | Minchen Zhu Lijian Wu Youtong Fang Thierry Lubin | 2019 | CES Transactions on Electrical Machines and Systems2019，3，2： | 1 |
| 8 | Optimization of Cross Angle Based on the Pumping Dynamics Model 显示文摘 | MA Jien FANG Youtong XU Bing | 2010 | Journal of Zhejiang University : Science A2010，11，3： | 1 |
| 9 | Difference in Unbalanced Magnetic Force of Fractional-Slot PM Machines between Internal and External Rotor Topologie显示文摘This paper presents a comparative investigation into unbalanced magnetic force(UMF)of asymmetric permanent magnet machines without rotor eccentricities,particularly focusing on the difference between internal-and external-rotor topologies.The asymmetric field distribution results in radial and tangential asymmetric force waves.Although the radial and tangential stresses are in different direction,the UMF components they produce are nearly aligned.The UMF from asymmetric radial force wave can be additive or subtractive to that from asymmetric tangential force wave.Investigation shows that for the same pole slot number combination,if the UMFs due to radial and tangential force waves are additive in internal rotor machine,they are subtractive in the external rotor counterpart,and vice versa.Investigation reveals a general rule determining whether additive or cancelling:for a UMF produced by any two field harmonics,they are additive if the higher order is produced by the outer part outside the airgap,but cancelling if the higher order is produced by the inner part.Therefore,for a machine with pole number 2p=3k+1,they are additive if it is an external-rotor machine,but otherwise subtractive.On the other hand,for a machine with pole number 2p=3k-1,they are subtractive if it is an external-rotor machine,but otherwise additive.For the UMF due to armature reaction only,they are subtractive for external-rotor machines,but otherwise additive.The investigation is carried out by an analytical model and validated by finite element analysis. | L.J.Wu Z.Q.Zhu Youtong Fang Xiaoyan Huang | 2017 | CES Transactions on Electrical Machines and Systems2017，1，2： | 0 |
| 10 | 基于预测电流控制的CIT400高速综合检测列车运行特性仿真分析方法显示文摘基于CIT400高速综合检测列车牵引传动系统的结构和牵引特性,运用MATLAB/Simulink软件建立预测电流控制下的高速综合检测列车牵引传动系统仿真模型,仿真分析列车在牵引和制动工况下受电弓短时断电及网压波动时的运行特性,并与实测数据进行对比分析。研究表明:仿真结果与实测数据基本一致,建立的仿真模型能正确反映列车的运行特性,能够满足列车实际运行的动静态要求。 | Fang, Youtong Liu, Li Ma, Jien Pei, Chunxing | 2012 | 中国铁道科学2012，，4： | 0 |
| 11 | Inhomogeneous ablation behaviors and failure mechanism of copper cathode in air显示文摘The copper cathode ablation limits the maximum power and operating time of arc heaters significantly.In this work,copper cathodes were tested in an ablation testing system to investigate the ablation behaviors and mechanism of copper cathode in air.The microstructure of the ablated cathodes was analyzed,and the ablation rate was measured.The maximum depth and ablation rate increased with the electronic discharge.The mean ablation rate was compared with the prediction by a thermophysical theoretical model.Many ablation pits formed in the ablated surface and evolved into crater-like structures with unexpected depth as the ablation time was prolonged.The presence of ablation pits and crater-like structures suggested an inhomogeneous ablation behavior of the copper cathode in air.The underlying mechanism is proposed to explain the ablation failure of copper cathode in the high-power arc heater.Future attention to improving the service life of copper cathode could be focused on the surface modification to reduce the ablation inhomogeneity. | GUAN WeiMian YUAN Jie WANG YongFeng ZHANG HuanYu LV Hao YANG Hong ZHU Tao FANG YouTong LIU JiaBin WANG HongTao YANG Wei | 2020 | Science China(Technological Sciences)2020，63，11： | 0 |
| 12 | High-speed railway transport technology显示文摘1 Introduction The high-speed railway is one of the most active technological fields in China.Since the opening of the high-speed line between Beijing and Tianjin in 2008,China has built the world’s largest high-speed railway network with the highest average operating speed in the world(Bian et al.,2019;Cao et al.,2021;Chen et al.,2022).China has also created the world’s largest,most advanced,and comprehensive scientific research system and industrial chain in the field of high-speed railways.Currently,China’s high-speed railway oper‐ating mileage,the total number of research personnel related to high-speed railways,and the total research investment in them,all exceed the sum of those of all other countries. | Youtong FANG Jien MA | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
| 13 | Recent advances in traction drive technology for rail transit显示文摘The traction drive system is the“heart”of rail transit vehicles.The development of sustainable,secure,economic,reliable,efficient,and comfortable contemporary rail transportation has led to increasingly stringent requirements for traction drive systems.The interest in such systems is constantly growing,supported by advancements such as permanent magnet(PM)motors,advanced electronic devices such as those using silicon carbide(SiC),new-generation insulating materials such as organic silicon,and advanced magnetic materials such as rare-earth magnets and amorphous materials.Progress has also been made in control methods,manufacturing technology,artificial intelligence(AI),and other advanced technologies.In this paper,we briefly review the state-of-the-art critical global trends in rail transit traction drive technology in recent years.Potential areas for research and the main obstacles hindering the development of the next-generation rail transit traction drive systems are also discussed.Finally,we describe some advanced traction drive technologies used in actual engineering applications. | Jien MA Chao LUO Lin QIU Xing LIU Bowen XU Jiabo SHOU Youtong FANG | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
| 14 | Progress in research on nanoprecipitates in high-strength conductive copper alloys: a review显示文摘High-strength conductive Cu alloys play an essential role in high-speed railways,5G networks,and power transmission.The compound precipitates of alloying elements such as Cr,Zr,Fe,and Si in Cu alloys significantly regulate the microstructure and properties of these alloys.They can ensure that the alloys have high strength without damaging conductivity seriously,which is usually a difficult problem in the development of Cu alloys.This paper systematically expounds on the microstructure and concerned factors of compound precipitates in high-strength conductive Cu alloys such as Cu-Cr-Zr,Cu-Zr,Cu-Ni-Si,and Cu-Fe-P.In particular,factors affecting the precipitates are summarized from the perspectives of composition and process to guide the regulation of properties.Some new,promising,high-performance Cu alloys,including Cu-Co-Si,Cu-Co-Ti,and Cu-Fe-Ti,are described.Finally,we look at the research prospects for precipitation-strengthened Cu alloys. | Jian YU Feng ZHAO Huiya YANG Jiabin LIU Jien MA Youtong FANG | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
| 15 | An overview of bearing voltages and currents in rail transportation traction motors显示文摘In modern rail transportation,inverter drive systems have been extensively used due to their excellent speed control capabilities.However,in recent years,premature failure problems caused by bearing voltage and current phenomena have been frequently reported in electric motors,with electrical bearing failures making up a considerable percentage.The purpose of this review is to provide a comprehensive overview of facets relating to the electrical erosion of bearings in an electrical environment represented by railway vehicles.First,the origins of the phenomenon as well as typical bearing electrical failure modes are discussed.Next,we introduce the distinctive features of the electrical environment of railway traction motor bearings,including output voltages with high common-mode components and systems with complex grounding configurations.Then,we classify the fundamental mechanisms for generating bearing voltages/currents into four groups,and present their modeling processes,including equivalent circuit establishment and parameter determination methods.Furthermore,we summarize the strategies frequently used to protect bearings,and describe a typical solution to suppress electrical bearing failures in railway vehicles.Finally,we present a case example to illustrate a research procedure for systematic investigation of inverter-induced bearing currents in rail transportation. | Yao LI Lin QIU Yongjian ZHI Zifan GAO Jien MA Jian ZHANG Youtong FANG | 2023 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2023，24，3： | 0 |
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