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International Conference on Electrical Machines and Systems (ICEMS)

作者： Xiaojie Wang Kai Yang Zhicheng Pan State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei China

ISBN: (纸本)9781479988068

The paper presents a novel interior permanent magnet machines used for spindle drive where wide constant power speed range is necessary. To obtain wide constant power speed range, segmented permanent magnet was adopted. And finite element analysis is used to verified the flux weakening capability of design. Besides, in order to check the influences of segmented permanent magnet on cogging torque, it was also analyzed by finite element analysis.

关键词： Permanent magnets Decision support systems Finite element analysis Forging Torque Permanent magnet motors Magnetic flux

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A peak load regulation scheme for Hubei power grid with UHVDC integration

A peak load regulation scheme for Hubei power grid with UHVD...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： Ni Zeng Mei Li Buhan Zhang Ruoxi Zhu Minwei Wang Shuang Zhao Chengxiong Mao State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Under the background of transmitting thermal power via UHV transmission line from Mengxi to Hubei in the long-term planning, this paper analyzed Hubei power grid's peak load regulation scheme which Mengxi UHVDC involved in. Based on the energy-efficient power generation scheduling approach and multiple constraints of units, a peak load regulation scheme under the coordinated operation of thermal power, hydropower, pumped-storage and UHVDC power in a calculating level year was given. It is indicated that the peak regulation capacity shortage problem in Hubei is solved effectively with Mengxi UHVDC integration.

关键词： Thermal loading Hydroelectric power generation Decision support systems Energy efficiency Power industry Thermal analysis

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stateflow based carrier phase-shifted SPWM and its application in DT-STATCOM

Stateflow based carrier phase-shifted SPWM and its applicati...

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International Conference on Electric Utility Deregulation and Restructuring and Power Technologies (DRPT)

作者： Haihuan Wu Xianggen Yin Jinmu Lai Jian Dai Zhe Zhang Minghao Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781467371070

Combining switching characteristics of power electronic devices and state transitions in carrier phase-shifted SPWM (CPS-SPWM), this paper uses graphic stateflow toolbox of Matlab/Simulink to design the process of CPS-SPWM. Then it is applied to STATCOM which is integrated with distribution transformer (DT-STATCOM) for PWM signal generation. Simulation results are presented to prove that the method is valid and effective for reactive power compensation. Meanwhile, software-in-loop (SIL) test and automatic code generation are also carried out. Results of experimental test with DSP TMSF28335 have validated the theoretical contributions of the paper. PWM signal comparison of both simulation and experiment result shows that this method has both the feasibility and effectiveness of software and hardware design. With this method, design of CPS-SPWM can be more rapid, efficient and convenient.

关键词： Pulse width modulation Mathematical model Switches MATlab Reactive power Digital signal processing

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A consequent pole, dual rotor, axial flux vernier permanent magnet machine

A consequent pole, dual rotor, axial flux vernier permanent ...

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International Conference on Ecological Vehicles and Renewable Energies (EVER)

作者： Tianjie Zou Ronghai Qu Jian Li Dawei Li Leilei Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

A consequent pole, dual rotor, axial flux vernier permanent magnet (VPM) machine is developed to reduce magnet usage and increase torque density. Its end winding length is much shorter than that of regular VPM machines due to its toroidal winding configuration. The configurations and features of the proposed machine are discussed. Benefited from its vernier and consequent pole structure, this new machine exhibits much higher back-EMF and torque density than that of a regular dual rotor axial flux machine, while the magnet usage is halved. The influence of main design parameters, such as slot opening, ratio of inner to outer stator diameter, magnet thickness etc., on torque performance is analyzed based on the quasi-3-dimensional (quasi-3D) finite element analysis (FEA). The analyzing results are validated by real 3D FEA.

关键词： Reliability engineering Windings Stator windings Stator cores

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Coupling effects of mechanical vibrations and thermal cycling on reliability of CCGA solder joints

Coupling effects of mechanical vibrations and thermal cyclin...

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作者： Ding, Ying Tian, Ruyu Wang, Xiuli Hang, Chunjin Yu, Fang Zhou, Ling Meng, Xiangang Tian, Yanhong Beijing Institute of Control Engineering Beijing100190 China State Key Lab. of Advanced Welding Production Technology Harbin Institute of Technology Harbin150001 China

The microstructures and crack propagation behavior of CCGA (ceramic column grid array) solder joints after sinusoidal vibration loading, random vibration loading, and thermal cycling test have been discussed in this study. The failure mechanism of solder joints was analyzed using an experimental method and finite element analysis. It was found that the failed solder joints mainly distributed at the peripheral area in the solder column arrays and the crack initiation was mainly caused by mechanical vibrations. The deformation of PCB (printed circuit board) introduced by mechanical vibrations brought the outermost solder columns in CCGA devices with significant stress concentration and induced the initiation of cracks. Furthermore, cracks propagated during the process of mechanical vibrations and thermal cycling. The cracks propagated rapidly and the solder joints finally failed. The structure of the PCB holder was improved to relieve the vibration response from the peripheral joints. No visible crack was found in the solder joints after the same mechanical vibrations and thermal cycling test. The reliability of solder joints have been greatly improved with the new PCB holder. © 2015 Elsevier Ltd. All rights reserved.

关键词： Vibrations (mechanical)

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PEG-assisted hydrothermal synthesis of VO2（A） nanowires with remarkable optical switching properties

PEG-assisted hydrothermal synthesis of VO2（A） nanowires wi...

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International Conference on Mechanics,Materials and Structural engineering 2016(ICMMSE 2016)

作者： Chengqian Wang Xiangli Liu Weiming Xiong Yue Zheng Shenzhen Key Laboratory of Advanced Materials Shenzhen Engineering Lab of Flexible Transparent Conductive FilmsDepartment of Materials Science and EngineeringShenzhen Graduate SchoolHarbin Institute of Technology State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and EngineeringSun Yat-sen University Micro & Nano Physics and Mechanics Research Laboratory School of Physics and EngineeringSun Yat-sen University

High quality single crystalline VO（A） nanowires were synthesized by a facile hydrothermal method using oxalic acid as reducing agent and polyethylene glycol 6000 as surfactant. It was found that polyethylene glycol 6000 can effectively accelerate the transformation from VO precursor to VO（B）, and there is no intermediate phase VO·HO formed. Thus less time and lower temperature were needed in our hydrothermal method. The investigation of growth mechanism indicates an oriented attachment growth process in the hydrothermal system. In addition, the temperature-dependent optical switching properties have been studied. The results show that VO（A） nanowires exhibit distinct temperature-dependent optical switching properties, which can be potentially explored for optical switching devices.

关键词： PEG-assisted hydrothermal synthesis of VO2 nanowires with remarkable optical switching properties

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Optimization of the lattice function in the planar undulator applied for terahertz FEL oscillators

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Chinese Physics C 2014年第3期38卷 72-77页

作者：杨磊秦斌杨军刘遐龄谭萍胡桐宁 State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

Since the beta function of the electron beam within the undulator has a great influence on the power gain of the free electron laser（FEL）,optimization of the undulator lattice becomes *** this paper,the transfer matrix of the planar undulator is obtained from differential equations of the electron *** on this,the lattice function of the planar undulator in a terahertz FEL oscillator proposed by Huazhong University of Science and technology（HUST-FEL） is optimized and the expressions of the average beta function are *** accuracy of the optimization result was confirmed well by the numerical *** application range of this analytical method is given as *** last,the emittance growth in the horizontal direction due to the attenuation of the magnetic field is discussed.

关键词： planar undulator beam transport lattice optimization

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Torque Ripple Reduction for Interior Permanent Magnet Machines Using Overlapping Windings with Fractional Slot Per Pole Pair

Torque Ripple Reduction for Interior Permanent Magnet Machin...

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IEEE International Conference on Applied Superconductivity and electromagnetic Devices

作者： Jing Rao Rong Hai Qu Da Wei Li Yu Ting Gao State Key Laboratory of Advanced Electromagnetic Engineering and Technology College of Electrical & Electronic Engineering Huazhong University of Science and Technology

ISBN: (纸本)9781467381086

Torque ripple is a major concern in interior permanent magnet (IPM) machines, which is usually above 20% in conventional IPM machines, and for some cases, such as spindle motors, this value is too high to be accepted. In this paper, armature windings with fractional-slot per pole pair are employed to reduce the torque ripple. First, it is theoretically explained why this windings are helpful to lower torque ripple without the cost of average torque. Then, the effect of slot pole combinations on torque ripple is investigated. Moreover, the electromagnetic performance, such as back EMF, cogging torque, and torque ripple of an IPM machine with the proposed windings is compared to that of the IPM machine with conventional integral-slot distributed windings (ISDW). It is shown that the cogging torque of IPM machine with fractional-slot per pole pair windings could be as low as 0.2%, and torque ripple is only 3% without any other special measures such as skew or dummy slots.

关键词： Torque ripple Interior permanent magnet (IPM) machine Fractional-slot Integral-slot distributed winding (ISDW)

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Topologies for Fully Superconducting Machines

Topologies for Fully Superconducting Machines

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IEEE International Conference on Applied Superconductivity and electromagnetic Devices

作者： Feng Lin Rong Hai Qu Da Wei Li The State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

ISBN: (纸本)9781467381086

Various topologies for fully superconducting machines were analyzed and compared in this paper. The cryogenic system, electromagnetic design, and winding mechanical support were investigated in details. Furthermore, the existing topologies are overviewed in terms of pros and corns. Then, a novel fully superconducting machine topology-fully superconducting geared machine is proposed, which is proved to be with higher torque density than that of regular full superconducting topologies and contactless torque transfer capability.

关键词： Fully superconducting Machines topology Direct driver wind generators

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Reduction of Sub-harmonic Effect on the Fractional Slot Concentrated Winding Interior PM Machines by Using Spoke-type Magnets

Reduction of Sub-harmonic Effect on the Fractional Slot Conc...

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IEEE International Electric Machines and Drives Conference

作者： Yawei Wang Ronghai Qu Leilei Wu Haiyang Fang Dawei Li State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology

ISBN: (纸本)9781479979424

In this paper, a spoke-type IPM motor (buried with circumferentially magnetized magnets) with fractional-slot concentrated windings is designed to block the two-pole sub-harmonic and, thus, reduce the iron core losses and torque ripple. This is demonstrated by the comparison of a conventional V-type IPM configuration and a designed spoke-type machine. Both of them have 12-slot/10-pole configurations with the same stator structure. The simulation results indicate that under the same design specifications, the spoke-type motor has less magnet consumption and exhibits much smaller iron core losses and torque ripple than that of its V-type counterpart, especially when operated at high speed. Finally, the mechanical stress of the designed spoke-type machine rotor is analyzed by finite element analysis.

关键词： Finite element analysis Fractional slot concentrated winding High speed Mechanical stress Permanent magnet machine Spoke-type Sub-harmonic V-type

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