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Annual Conference of the IEEE Industrial Electronics Society

作者： Huangda Lin Siwei Cheng Dong Wang Zhewu Jia National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval Univ. of Engineering

ISBN: (纸本)9781479917631

A circular winding brushless DC (CWBLDC) machine is essentially a trapezoidal-EMF multiphase permanent magnet machine with the associated commutation circuit. It can achieve the same level of torque ripple performance as sinusoidal-EMF permanent magnet synchronous machines (PMSMs), yet boast much higher torque density since the iron core is more fully utilized with trapezoidal EMFs. The commutation circuit is an integral part of this machine and should be properly controlled. This paper presents a load commutation method for CWBLDC machine, which relies on the EMF of its load (the motor) to reverse the phase current direction. power devices of the commutation circuit can be turned off with no current flowing through, which can be considered as a form of soft switching. The load commutation process is analytically derived and critical conditions for successful commutations are highlighted. Field-circuit coupled analysis have been performed to verify the load commutation method. A 10 kW, 8-pole, 46-slot CWBLDC prototype has been designed, fabricated and tested to verify the analysis.

关键词： Brushless dc(BLDC) machine Circular winding Load commutation commutating circuit iron core Commutation Permanent magnet synchronous machines LOAD brushless machine DC machines winding (process) electric current critical condition Electromagnetic fields European Monetary Fund electromotive forces

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Adaptive non-singular terminal sliding mode control for permanent magnet synchronous motor speed regulation system 5

Adaptive non-singular terminal sliding mode control for perm...

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5th IEEE Information technology, Networking, Electronic and Automation Control Conference, ITNEC 2021

作者： Li, Chuanming Guo, Yong Wang, Yachen Sun, Jingguang Jiangsu Automation Research Institute Lianyungang222061 China Northwestern Polytechnical University School of Automation Xi'an710072 China Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan430033 China

ISBN: (纸本)9781665415989

This paper studies the control problem of the permanent magnet synchronous motor (PMSM) combining terminal sliding mode control and adaptive control. An adaptive terminal sliding mode control strategy is designed based on the fast terminal sliding manifold, which can make sure that the system states converge to a small neighborhood around zero in finite time. A rigorous proof is proved for the designed controller via Lyapunov stability theory. The simulation results are presented to illustrate the effectiveness of the presented control scheme. © 2021 IEEE.

关键词： Robust control

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Perovskite films with gradient bandgap for self-powered multiband photodetectors and spectrometers

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Nano Research 2023年第7期16卷 10256-10262页

作者： Chuantian Zuo Lixiu Zhang Xiyan Pan He Tian Keyou Yan Yuanhang Cheng Zhiwen Jin Chenyi Yi Xiaoliang Zhang Wu-Qiang Wu Qinye Bao Liyuan Han Liming Ding Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China School of Physics and Electronic Science East China Normal UniversityShanghai 200241China School of Integrated Circuits Tsinghua UniversityBeijing 100084China School of Environment and Energy South China University of TechnologyGuangzhou 510000China School of New Energy Nanjing University of Science and TechnologyJiangyin 214443China School of Physical Science and Technology Lanzhou UniversityLanzhou 730000China State Key Laboratory of Power System Department of Electrical EngineeringTsinghua UniversityBeijing 100084China School of Materials Science and Engineering Beihang UniversityBeijing 100191China School of Chemistry Sun Yat-sen UniversityGuangzhou 510006China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Key Laboratory of Semiconductor Materials Science Beijing Key Laboratory of Low Dimensional Semiconductor Materials and DevicesInstitute of SemiconductorsChinese Academy of SciencesBeijing 100083China

Bandgap-graded materials present varying spectral responses at different positions,making them possible to be used as an alternative to photoactive materials array in multi-spectral responsive devices,thus miniaturizing the ***,the preparation of bandgap-graded materials usually requires complicated deposition *** we report a facile lowtemperature solution process to make films with lateral bandgap gradients,which form spontaneously via self-spreading and interdiffusion of *** show lead halide perovskite films with MAPbCl_(3)-MAPbBr_(3)and MAPbBr_(3)-MAPbI_(3)gradients,which exhibit light absorption onsets ranging from 410 to 781 *** bandgap-graded films were used to make self-powered multiband photodetectors,which show different spectral responses at different positions without applying bias ***,self-powered spectrometers were made by using the multiband photodetectors.

关键词： self-spreading interdiffusion bandgap-graded perovskite multiband photodetectors self-powered spectrometers

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Modeling of Amplitude-phase Coupling Effect of Mixing Electronic Attenuator

Modeling of Amplitude-phase Coupling Effect of Mixing Electr...

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International Conference on Communication technology (ICCT)

作者： Fangmin He Qiaran Lu Qing Wang Jin Meng National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

The amplitude-phase coupling (APC) effect of the mixing electronic attenuator (MEA) is the main factor that limits its application in microwave interference cancellation system. The APC effect will cause the MEA to have an attenuation-dependent phase. In this paper, a mathematical model of MEA taking into account the APC effect is established by means of RF circuit equivalence. Simulations and experiments are also carried out to analyze the APC effect. The simulation and experiment results both verify the correctness of the proposed model. It is interesting to find that the phase deviation of output signal decreases oppositely with the increase of the input signal power.

关键词： Mathematical model Junctions integrated circuit modeling Schottky diodes Load modeling Attenuators Attenuation

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Research on Emergency Braking Strategy of Driverless Vehicle Based on Overload Optimization Control

Research on Emergency Braking Strategy of Driverless Vehicle...

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International Conference on Electrical Machines and systems (ICEMS)

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

ISBN: (纸本)9781728133997

The development of driverless technology has made transportation more convenient and intelligent, but researches on the safety braking of driverless vehicle are less reported. To solve this problem, this paper puts forward an overload optimization control mechanism in the process of emergency braking. According to the types of the collision objects, the collision was divided into three classes, which were corresponded to the damage classes of passengers and overload optimization curves. The feasibility of the overload control mechanism was verified by the permanent magnet linear synchronous motor (PMLSM) overload optimization control simulation. The PMLSM prototype overload test platform was established to carry out the overload control tests. The reliability of the test platform and the feasibility of the overload control were verified by the speed closed-loop reciprocating movement test and the overload optimization speed closed-loop control test.

关键词： Acceleration Optimization Permanent magnets Autonomous automobiles power systems Synchronous motors Collision avoidance

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Mathematical Model of Pole-to-ground DC Fault in power Supply system of Twenty-four-pulse Diode Rectifier

Mathematical Model of Pole-to-ground DC Fault in Power Suppl...

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China International Electrical and Energy Conference (CIEEC)

作者： Chun Li Fan Ma Lijun Fu Jianqing Shen Naval University of Engineering National Key Laboratory of Science and Technology on Vessel Integrated Power System Wuhan China

ISBN: (数字)9781728116754

ISBN: (纸本)9781728116761

Twenty-four-pulse diode rectifier (TFPDR) with high resistance grounding at neutral point has been widely used in various isolated power systems. Many diode conduction combinations, complex and short transient process make it hard to model the dynamic behavior of pole-to-ground (P-to-G) dc fault of TFPDR. To solve this problem, a large signal mathematical model of P-to-G dc fault in TFPDR is established, which is based on switching function law and harmonic balance principle. Through comparison between mathematical calculation and physical experiment, it is validated that the mathematical model is effective and can accurately reflect the transient behavior of P-to-G dc fault.

关键词：

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Capacitor voltage balance control of active neutral point clamped five-level inverter

Capacitor voltage balance control of active neutral point cl...

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CSAA/IET International Conference on Aircraft Utility systems (AUS 2018)

作者： Weiwei Ye Ziling Nie Junjie Zhu Yi Han Jun Sun National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering WuHan China

ISBN: (纸本)9781510872745

The prospects for the active neutral point clamped five-level inverter are broad in medium-voltage high-power applications. This paper has analyzed the relationship between dc-link capacitors voltage and neutral point current and then proposed a control strategy based on zero-sequence voltage injection to regulate the voltage across the dc-link capacitors. In view of an excessive fluctuation of the voltage across Flying capacitors, a more accurate control method is proposed by introducing the auxiliary modulation wave. The simulation results show that the proposed control methods are feasible and effective.

关键词： Active neutral point clamped five-level Carrier phase-shift PWM Zero-sequence voltage Auxiliary modulation wave

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Influence of Wound Stress on Magnetic Property of Toroid Sample

Influence of Wound Stress on Magnetic Property of Toroid Sam...

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International Conference on Applied Superconductivity and Electromagnetic Devices, ASEMD

作者： Youxing Xiong Yu Wang Xiwen Yu Junquan Chen Dong Wang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (数字)9781728152158

ISBN: (纸本)9781728152165

Nowadays, wound stress of toroid sample is usually ignored, when its magnetic properties are measured. However, it does harm to magnetization property, and increase the iron loss. According to our studies, wound stress can cause a ~20% increase to iron loss of FeCoV alloy at 400Hz~1000Hz. The influence of wound stress on electrical resistivity of FeCoV alloy is about 1%, and stress is less likely to cause a significant change in classic eddy current loss component. Iron loss increases with wound stress because the static hysteresis loss and excess loss increase with wound stress. Short motor is more sensitive to the wound stress than long motor.

关键词： Stress Induction motors Iron Hysteresis motors Metals Magnetic properties Magnetic hysteresis

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A Fast Method for Calculating the Air-Gap Flux and Electromagnetic Force Distribution in Surface Permanent Magnet Motors

A Fast Method for Calculating the Air-Gap Flux and Electroma...

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International Conference on power Electronics and Motion Control (IPEMC)

作者： Yajun Lv Siwei Cheng Dong Wang Junquan Chen National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (数字)9781728153018

ISBN: (纸本)9781728153025

This paper proposes a new method for calculating the air-gap flux and electromagnetic (EM) force distribution induced by PWM current harmonics in inverter-fed surface permanent magnet motors. First, the concept of permeance distribution function (PDF) is introduced to calculate the air-gap flux distribution excited by armature currents of the motor. Then, the air-gap flux distribution excited by permanent magnets is calculated using the relative permeance method. The actual air-gap flux distribution is consequently obtained by the superposition principle. Using the Maxwell stress tensor method, the radial EM force distribution on the motor air gap can be obtained. Finally, the calculated EM force distribution is evaluated by 2-D FFT and validated against finite element analysis, demonstrating good accuracy and very fast computation time.

关键词： Magnetostatics Air gaps Force Pulse width modulation Permanent magnet motors Synchronous motors Finite element analysis

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Practical design considerations of stator lamination fixtures in permanent magnet machines

Practical design considerations of stator lamination fixture...

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International Conference on power Electronics and Motion Control (IPEMC)

作者： Siwei Cheng Huangda Lin Zhewu Jia Dong Wang National Key Laboratory of Science and Technology on Vessel Integrated Power System Naval University of Engineering Wuhan China

ISBN: (纸本)9781509012114

It is mechanically convenient to employ end plates and pulling bars to support the stator lamination in PM machines. However, the structure may degrade the electromagnetic performance of the machine if poorly designed. This paper shows that the pulling bar and the end plate structure could affect machines' performance through two mechanisms. Particularly, the conductive cage mechanism is more dangerous and is generally overlooked. The paper thus proposes three design rules to eliminate the adverse effect associated with the supporting structure of the stator lamination. Experimental and simulation validations confirm the effectiveness of proposed design rules.

关键词： Bars Lamination Stator cores Stator windings Metals Insulation

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