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Power and Electrical technology Conference (APET), Asia

作者： Yuhang Xie Fei Xiong Rui Yan Yu Xiang Kai Yang Weican Yan School of Reliability and Systems Engineering Beijing University of Aeronautics and Astronautics Beijing China State Key Laboratory of Advanced Electromagnetic Technology Huazhong University of Science and Technology Wuhan China Marketing Department SG Micro Corp Beijing China Wolong Electric Group Co. LTD Shangyu China

The torque performance of the interior permanent magnet synchronous motor (IPMSM) has been widely concerned and studied for many years. This article focuses on the structure design and optimization of the IPMSM in the aircraft drive system, and aiming to improve the torque density and reduce the torque ripple. Firstly, the original structure of the IPMSM is given. And then, a fractional slot winding and ∇-type rotor magnetic pole topology are proposed as the optimized IPMSM structure in this article. In addition, the comparison of the original and optimized structure is studied by the simulation. Finally, the performance of an optimized prototype is analyzed by experimental test, and the validity of the design optimization method for proposed IPMSM structure is verified.

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Research on Mesh Generation technology Based on Delaunay Triangulation

Research on Mesh Generation Technology Based on Delaunay Tri...

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International Conference on Vacuum Electronics

作者： Longwei Deng Junhui Yin Qing He Xinyu Cao Chaoyang Zhang Junhao Cui Bin Li National Key Laboratory of Science and Technology on Vacuum Electronics Key Laboratory of Large-Scale Electromagnetic Industrial Software Ministry of Education School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu P. R. China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen P. R. China

ISBN: (数字)9798350348705

ISBN: (纸本)9798350348712

With advancements in computer technology, modeling and simulation have become increasingly important in reducing development costs and enhancing performance. And the core of simulation is mesh generation, the first and most fundamental step in numerical computations. In this paper, utilizing the Delaunay triangulation method, we've developed a three-dimensional mesh generator for microwave tube structures, for significantly enhancing mesh quality and stability. Additionally, the mesh optimization algorithm based on Quasi-Newton method effectively refines poor-quality meshes, a crucial step towards ensuring a numerical simulation reliability under various operational conditions. The numerical results have shown the success of the implemented mesh optimization algorithm, particularly in significantly improving the quality of poor-quality mesh elements. This mesh generator will be incorporated as a core component of Microwave Tube Simulator Suite.

关键词： Microwave technology Shape Numerical simulation Generators Stability analysis Robustness Vacuum electronics Optimization Mesh generation Numerical stability

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Design of Hybrid Excited Asymmetric-Stator-Pole Doubly Salient Machine

Design of Hybrid Excited Asymmetric-Stator-Pole Doubly Salie...

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International Conference on Electrical Machines

作者： Mingjie He Wei Xu Caiyong Ye Wei Hua State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China School of Electrical Engineering Southeast University Nanjing China

Doubly salient permanent magnet machine (DSPMM) enjoys the advantages of high torque density, simple rotor structure, high reliability, etc. However, the air-gap flux density is difficult to regulate due to that the air-gap magnetic field is produced only by permanent magnets (PMs). Thus, this paper proposes a hybrid excited asymmetric-stator-pole doubly salient machine (HE-ASPDSM) and its air-gap flux density can be regulated easily by controlling the excitation current of field winding. The topologies and operation principle of the HE-ASPDSM are studied firstly based on modern winding theory and two-dimension finite element analysis (2D FEA). Then, the comparison of no-load flux linkage, back electric magnetomotive force (EMF) and air-gap flux density of different topologies is made. Besides, the expression and harmonic components of air-gap flux density are also derived based on mathematical analysis. And then, the influence of key design parameters on the cogging torque, flux regulation ability, electromagnetic torque, losses and efficiency is investigated in details. Finally, the analysis of main performance indexes is performed based on the proposed 12/7 (stator/rotor poles) HE-ASPDSM. It indicates that the proposed 12/7 HE-ASPDSM has strong air-gap flux regulation ability.

关键词： Air-gap flux regulation Hybrid excited asymmetric-stator-pole doubly salient machine (HE-ASPDSM) Mathematical analysis Two-dimension finite element analysis (2D FEA)

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Design of simple stellarator using tilted toroidal field coils

arXiv

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arXiv 2020年

作者： Suzuki, Yasuhiro Huang, Jie Wang, Nengchao Ding, Yonghua National Institute for Fusion Science National Institutes of Natural Sciences Toki5095292 Japan Graduate University for Advanced Studies SOKENDAI Toki5095292 Japan National Institute for Fusion Science National Institutes of Natural Sciences Toki5095292 Japan International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

This paper deals with the design of the stellarator field with the simple coil set. In order to realize the stellarator field by the simple coil set, the tilted toroidal field coil uses for creating the rotational transform. Sixteen tilted TF coils create the small radial field and large vertical field. With reducing the vertical field of the tilted toroidal field coil by the axisymmetric poloidal field coil, the stellarator field can be made. The formation of clear and nested flux surfaces is confirmed, and the rotational transform is proportional to the tilting angle of the toroidal field coil. Main components of the magnetic field for the simple stellarator in this paper are the large mirror ripple and small helical ripple. This is a similar property to the quasi-isodynamic configuration like the Wendelstein 7-X stellarator. The collisionless orbit for the proton is studied. For a moderate tilting angle of the toroidal field coil, the confinement of the passing and trapped particles improves. © 2020, CC BY.

关键词： Magnetohydrodynamics

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Observation of intrinsic crystal phase in bare CrI3 ferromagnetism

arXiv

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arXiv 2022年

作者： Liu, Zhen Guo, Yongzheng Chen, Zhiyong Gong, Tao Li, Yue Niu, Yuting Cheng, Yingchun Lu, Haipeng Deng, Longjiang Peng, Bo National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu611731 China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of China Chengdu611731 China Key Laboratory of Flexible Electronics Institute of Advanced Materials Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing211816 China

Intrinsic structural phase is a crucial foundation for the fundamental physical properties, and for creating innovative devices with unprecedented performances and unique functionalities. Long-range ferromagnetic orders of van der Waals CrI3 are strongly tied with interlayer stacking orders. However, the intrinsic structure of few-layer CrI3 still remains elusive;the predicted monoclinic phase has not yet been experimentally detected in bare few-layer CrI3. Here we uncover the intrinsic structure of few-layer CrI3 with interlayer antiferromagnetic coupling, which unambiguously show monoclinic stacking in both bare and hBN-encapsulated bilayer and tri-five-layer CrI3 throughout an entire temperature range from 300 to 10 K. An exotic spring damping effect from hBN encapsulation layers is experimentally observed in hBN/CrI3/hBN heterostructures, which partly hinders interlayer sliding of CrI3. This work demonstrates the intrinsic monoclinic crystal phase of few-layer CrI3 and associated correlation with magnetic orders, opening up numerous opportunities for creating magnetic texture by stacking design. © 2022, CC BY.

关键词： Chromium compounds

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Parameter Optimization of DOCR and FCL in Microgrids Based on Grey Wolf Optimizer

Parameter Optimization of DOCR and FCL in Microgrids Based o...

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International Universities Power engineering Conference

作者： Jiang Yi Dongyuan Shi State Key Laboratory of Advanced Electromagnetic Engineering and Technology Hubei Electric Power Security and High Efficiency Key Laboratory Huazhong University of Science and Technology Wuhan 430074 China State Key Laboratory of Advanced Electromagn

ISBN: (纸本)9781538629116

The operating time of directional overcurrent relays (DOCRs) can be reduced, while protection coordination is achieved, by setting the time dial setting (TDS) and pickup current of DOCRs. However, in the microgrids, the dual operating modes (grid-connected and islanded) and the introduction of distributed generations (DGs) bring some problems to coordination of DOCRs, due to changes in short-circuit levels. To limit the fault current levels and the effects of DGs on protection coordination, fault current limiters (FCLs) have been proposed. This paper employs grey wolf optimizer (GWO) to optimize the setting parameters of DOCRs and the values of FCLs not only in microgrids' two operating modes, but also under two different kinds of protection coordination schemes. The comparison between optimized results obtained by five algorithms demonstrates the outstanding performance of GWO in low dimensional optimization problems and its potential for improvement.

关键词： Directional overcurrent relays Grey wolf optimizer Microgrids Metaheuristic algorithm Protection coordination

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Design of Electric Spindle Control System for High-Grade CNC Machine Tools

Design of Electric Spindle Control System for High-Grade CNC...

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International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC)

作者： Jinhua Liang Haiping Xu Wei Liu Key Laboratory of Power Electronics and Electric Drive University of Chinese Academy of Sciences Institute of Electrical Engineering Chinese Academy of Sciences Beijing China Institute of Electrical Engineering Chinese Academy of Sciences Beijing China Qilu Zhongke Electric Advanced Electromagnetic Drive Technology Research Institute Jinan China

advanced CNC machine tool is one of the high-end equipment to promote the innovation and development of manufacturing industry, and electric spindle is the core component of CNC machine tool. Control system is the brain of CNC machine tools, responsible for receiving user instructions, sensor signals, feedback signals, after data processing and logical operation, send control instructions to the executive parts, so the design of the control system play a crucial role. This paper first constructs the hardware platform of two central control units, and designs the hardware circuit of DSP system, then constructs the three-layer software structure, and designs the flow chart of the main program, distributes the interrupt resources, and finally designs the flow chart of interrupt and fault protection subroutine. The experimental test shows that the maximum temperature rise of the enclosure of the electrical spindle prototype is 15.6 °C when the no-load 20000 rpm is stable, and the maximum radial runout is 1.5 um during the static test. The control system designed in this paper can meet the high-performance control requirements of electric spindle, and lay a good foundation for the later research of high precision control and holding technology.

关键词： Manufacturing industries Technological innovation Fault protection Transportation Prototypes Control systems Data processing

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Robust Nonlinear Adaptive Pressure Control of Polymer Electrolyte Membrane Fuel Cells Considering Sensor Failures

SSRN

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SSRN 2022年

作者： Chen, Jian Yao, Wei Lu, Qun Duan, Xiaohui Yang, Boping Zhu, Fengyu Cao, Xuexiang Jiang, Lin School of Electrical Engineering Yancheng Institute of Technology Yancheng224051 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronics Engineering Huazhong University of Science and Technology Wuhan430074 China Southwest Equipment Research Institute Co. Ltd Chongqing401121 China Department of Electrical Engineering and Electronics University of Liverpool LiverpoolL69 3GJ United Kingdom

This paper proposes a robust nonlinear adaptive pressure control (RNAPC) employing perturbation estimation technique to lengthen the life of the polymer electrolyte membrane fuel cells (PEMFCs). Since large deviations between the partial pressure of oxygen and hydrogen can lead to severe membrane damage, a robust and adaptive nonlinear control method needs to be designed for suppressing the deviations. Due to high nonlinearities, uncertainties, load disturbance and sensor failures in the PEMFCs, neither a traditional PI control nor feedback linearization control (FLC) can always provide satisfactory performances. In the design of RNAPC, an observer is designed to estimate a perturbation term containing system uncertainties, nonlinearities and disturbances. The estimation of perturbation is used for the compensation of actual perturbation. Then, an adaptive FLC of PEMFC system can be realized. Therefore, the RNAPC requires only few state measurements and is independent of accurate system model. Simulation results show that the RNAPC method has smaller deviations of partial pressure of oxygen and hydrogen and better dynamic performance than traditional PI control under load disturbance, and obtains higher robustness against uncertainties and sensor failures than traditional PI control and FLC. © 2022, The Authors. All rights reserved.

关键词： Proton exchange membrane fuel cells (PEMFC)

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Active Damping of Output LCL Filter in PWM Inverter-Fed Drive System With Long Motor Cable

Active Damping of Output LCL Filter in PWM Inverter-Fed Driv...

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International Conference on Electrical Machines and Systems

作者： Guangqiang Kan Shenghua Huang Xunhao Zou State Key Laboratory Ratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 R.P. China

ISBN: (纸本)9781467388634

In the PWM inverter-fed drive systems, overvoltage easily occur at the terminal of motor because of the high change rate of the inverter output voltage. Especially, when there is a long motor cable between the inverter and motor in some application, voltage reflection makes such phenomenon much more obvious. Overvoltage will lead to the failure of the motor and cable insulation. The LCL filter is often used to make the voltage sinusoidal, suppressing overvoltage. However, the LCL filter may causes the oscillation or resonance at system resonant frequency. One of the methods to solve the problem is passive damping. Although passive damping is simple and reliable, it will result in the loss of power. In this paper, a feasible and simple active damping algorithm for permanent magnet synchronous motor (PMSM) vector control system with LCL filter is proposed. The high-frequency component of the inverter side inductor current is multiplied by the virtual resistance to simulate the resistance drop. Meanwhile, the fundamental component of the inductor current inverter side can be used in the motor control. Compared with the traditional active damping, the proposed algorithms can save a set of sensors. The proposed algorithm is irrelevant to the design of standard vector control. Simulation results show that the proposed algorithm is feasible.

关键词： Active damping (AD) LCL filter long motor cable vector control

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Low-n global ideal MHD instabilities in CFETR baseline scenario

arXiv

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arXiv 2019年

作者： Han, Rui Zhu, Ping Banerjee, Debabrata Cheng, Shikui Yan, Xingting Zheng, Linjin CAS Key Laboratory of Geospace Environment Department of Engineering and Applied Physics University of Science and Technology of China Hefei230026 China International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei430074 China Department of Engineering Physics University of Wisconsin-Madison MadisonWI53706 United States Institute of Fusion Studies University of Texas at Austin AustinTX78712 United States

This article reports an evaluation on the linear ideal magnetohydrodynamic (MHD) stability of the China Fusion engineering Test Reactor (CFETR) baseline scenario for various first-wall locations. The initial-value code NIMROD and eigen-value code AEGIS are employed in this analysis. A good agreement is achieved between two codes in the growth rates of n = 1 − 10 ideal MHD modes for various locations of the perfect conducting first-wall. The higher-n modes are dominated by ballooning modes and localized in the pedestal region, while the lower-n modes have more prominent external kink components and broader mode profiles. The influences of plasma-vacuum profile and wall shape are also examined using NIMROD. In presence of resistive wall, the low-n ideal MHD instabilities are further studied using AEGIS. For the designed first-wall location, the n = 1 resistive wall mode (RWM) is found unstable, which could be fully stabilized by uniform toroidal rotation above 2.9% core Alfvén speed. Copyright © 2019, The Authors. All rights reserved.

关键词： Location

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