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Applied Superconductivity and Electromagnetic Devices, 2009. ASEMD 2009. International Conference on

Date 25-27 Sept. 2009

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Displaying Results 1 - 25 of 103
  • [Front matter]

    Page(s): c1 - c2
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  • [Title page]

    Page(s): 1
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  • Conference organization

    Page(s): 1
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  • Message from the chairman

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  • Table of contents

    Page(s): 1 - 7
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  • Modeling and control of power converters in UPS applications with PEM fuel cell

    Page(s): 1 - 4
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (308 KB) |  | HTML iconHTML  

    This paper investigates practical cost-effective DC/DC converter, DC/AC inverter and AC/DC rectifier for an uninterruptible power supply (UPS) system with backup proton exchange membrane fuel cell (PEMFC). The developed power converters can supply high quality power with flexible conversion functions, leading to the establishment of reliable power management for UPS applications. A comprehensive control strategy of the PEMFC is implemented for energy management of the UPS hybrid system. The performances of the proposed power converters and their controllers are evaluated by experimental results, showing that the developed UPS system with backup PEMFC and battery power sources is suitable for industry application. View full abstract»

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  • Design and electromagnetic analysis of a HTS linear synchronous motor

    Page(s): 5 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1096 KB) |  | HTML iconHTML  

    High temperature superconducting (HTS) linear synchronous motor (LSM) integrated with HTS magnetic levitation system, can realize self-levitation and self-guidance without any sliding friction, which will have important applications in many fields such as electromagnetic aircraft launch system, maglev transportation. This paper presents the design and electromagnetic analysis of a HTS LSM, which is levitated by a magnetic levitation system consisting of HTS bulks-permanent magnet (PM) guideways. Numerical analysis and magnetic field finite element analysis (FEA) methods are applied to analyze the thrust, levitation and guidance force characteristics, and the electromagnetic performance of HTS LSM under no-load and load situations are studied with the analysis results are given. Finally, the primary motor running testing results are provided. View full abstract»

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  • Characteristics of high temprature superconducting bulk magnet

    Page(s): 11 - 16
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    Recent progresses of high temperature superconducting (HTS) bulk technology have made various applications realistic, especially the compact and highly efficient electric motors, magnetic levitation systems and flywheel energy storage systems. In these applications, the HTS bulks are always exposed to the AC external magnetic field. It has previously observed that the trapped magnetic field of a HTS bulk is influenced even attenuated to zero when applied by the AC external magnetic field. Therefore it is important to clarify the trapped field attenuation characteristic in external AC magnetic field. In this work, the trapped field attenuation characteristics of HTS bulk magnet exposed to external AC magnetic field are studied with results presented. The models of HTS bulk with their properties are also summarized. Different magnetization methods are applied to magnetize the HTS bulks, and the magnetization characteristics having differences are illustrated with experimental results. View full abstract»

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  • Investigation of HTS bulk magnet linear synchronous motors

    Page(s): 17 - 21
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    A high temperature superconducting (HTS) linear synchronous motor (LSM) using HTS bulk magnets as secondary has lots of advantages than conventional permanent magnet (PM) LSM, such as smaller volume, less weight, bigger propulsion and so on. In this paper, the numerical model and equivalent magnetic-circuit of a HTS-LSM are built with results are presented. The magnetic field distribution and thrust force characteristics of the HTS-LSM are studied based on finite element method, and the analysis results are compared for different sizes of HTS bulk. The control strategy of Voltage Space Vector PWM (SVPWM) is applied to the running of the HTS-LSM, and the speed-adjusted system simulation model is also built by Matlab/Simulink lied on the mathematical model of HTS-LSM. This work has important meanings for the further studying of the HTS-LSM technology. View full abstract»

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  • HTS inductive energy controlled discharging characteristics and UPS applications

    Page(s): 22 - 25
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    High temperature superconducting (HTS) inductive energy charging and discharging characteristics have been theoretically analyzed, with detailed calculation and Matlab-based simulation models presented. Simulation results show the feasibility of the UPS applications using superconducting magnetic energy storage (SMES) technology with substantial advantages. View full abstract»

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  • Design and optimization of HTS magnets for SMES applications

    Page(s): 26 - 29
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    This paper introduces the design and optimization of high temperature superconducting (HTS) pancake-type and solenoid-type magnets. The practical results obtained provide the technical base to develop a HTS magnet prototype for superconducting magnetic energy storage (SMES) application. View full abstract»

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  • Superconducting air-core transformers and their electromagnetic analysis

    Page(s): 30 - 33
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    This paper provides a brief summary on various superconducting air-core transformers. The structural optimizations of the high temperature superconducting (HTS) air-core windings and relevant electromagnetic analysis have also been presented to achieve practical prototype design. View full abstract»

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  • Development and techniques of high current leads for HTS device applications

    Page(s): 34 - 41
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  • Development and applications of high Tc superconducting bulk materials

    Page(s): 42 - 47
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  • Study on characteristics of variable voltage and variable frequency motor with broken rotor bars

    Page(s): 48 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1370 KB) |  | HTML iconHTML  

    The induction motor is commonly operated at variable voltage and variable frequency state at present. The broken rotor bars fault is one common fault in the operation state. The electromagnetic and thermal characteristics of induction motor in broken rotor bar condition are very important fault characteristics. The electromagnetic field of induction motor at fault is analyzed by finite element method. Based on the results above, the temperature distribution and temperature rise of induction motor is analyzed in different broken rotor bar and typical area with maximal temperature rise is investigated too. At last, fault characteristics at broken rotor bar are obtained as a criterion for fault diagnosis. View full abstract»

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  • FEM simulations in designing saturated iron core superconducting fault current limiters

    Page(s): 52 - 55
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    Proper design of the iron cores is crucial for a saturated iron core superconducting fault current limiter. An optimized design requires guaranteeing sufficient magnetic saturation on the iron cores holding the AC coils, ensuring the efficiency of current limiting, minimizing the use of materials, as well as satisfying the safety and stability obligations. One of the key tasks in the design is the series of electromagnetic calculations, including the complex three-dimensional electromagnetic field calculation. It is extremely difficult to calculate the magnetic field distribution through purely analytical methods because of the nonlinearity of magnetization for a ferromagnetic material. We used Finite Element Method (FEM) to solve the field distribution problem, and adopted Ansoft Maxwell for the computer simulation. Simulation results revealed that the iron cores with varying cross-sections of different windows were most effective for obtaining ideal magnetizing force distribution. Optimized design of the iron cores could be based on this simulation method. Experiments on a 380 V/30 A prototype were carried out to verify the designs. View full abstract»

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  • Fuzzy neural network-based model reference adaptive inverse control for induction machines

    Page(s): 56 - 59
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (238 KB) |  | HTML iconHTML  

    In this paper, because the induction machines are described as the plants of highly nonlinear and parameters time-varying, in order to obtain a very well control performances that a conventional model reference adaptive inverse control (MRAIC) can not be gotten, a fuzzy neural network-based model reference adaptive inverse control strategy for induction motors is presented based on the rotor field oriented motion model of induction machines. The fuzzy neural network control (FNNC) is incorporated into the model reference adaptive control (MRAC), a fuzzy basis function network controller (FBNC) and a fuzzy neural network identifier (FNNI) for asynchronous motors adjustable speed system are designed. The proposed controller for asynchronous machines resolves the shortage of MRAC, and employs the advantages of FNNC and MRAC. Simulation results show that the proposed control strategy is of the feasibility, correctness and effectiveness. View full abstract»

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  • Performance analysis of electric machine drives for plug-in hybrid electric vehicles

    Page(s): 60 - 63
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    Much attention has been paid to electric vehicles recently due to environmental concerns. The plug-in hybrid electric vehicle (PHEV) consisting of both electricity storage and gasoline tank is welcome to electric vehicle market. In the PHEV system, the electric machine drive is one of the key issues. The ideal tendency is to use the drive machine over the entire torque/speed range with high starting torque and wide constant power range. The proposed PHEV drive system in this paper has only one electric machine which functions as either a motor or generator at a time and a supercapacitor bank for fast charging and discharging during the regenerative braking and fast acceleration. The drive machine must be designed for frequent start or stop, high acceleration or deceleration, high torque or power density, and good transient performance at all speed range. This paper analyzes the new PHEV resistance power and the driving traits. The drive system is modeled and analyzed by the powertrain system analysis toolkit (PSAT) encoded in Matlab/Simulink toolbox. It compares the different driving performances between the new PHEV and one traditional vehicle in urban dynamometer driving schedule (UDDS). View full abstract»

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  • Design of cold dielectric hts power cable

    Page(s): 64 - 67
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    This paper proposed a design methodology of cold-dielectric (CD) high temperature superconducting (HTS) power transmission cables. The methodology covers the effects of the electrical and mechanical properties of both insulation materials and HTS tapes; the dimensions of the conductor layers, insulation layers, shield layers, the annular cooling gap and the cryostat. The selection of insulation materials and the design of conductor and shield layers are different from the warm dielectric HTS power cable design. Design of a prototype of CD HTS power cable, rated 10 kV/1500 A, has been performed. Further verification has shown that the presented design method is correct and efficient. View full abstract»

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  • Energy management method of supercapacitors storage system for UPS applications

    Page(s): 68 - 72
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (662 KB) |  | HTML iconHTML  

    For some kinds of motor drive systems, such as the variable-pitch wind power system, the back-up power needs to output very high power in a short time to meet the emergency. And the work temperature range and cycle life is required more strictly. Supercapacitors are very suitable to be the energy storage component due to its advantages of high power density, high charging speed and extremely high cycling capability. However, the energy density of supercapacitor is relatively low, so the energy management method of supercapacitors based UPS is very important to increase the energy usage efficiency. In this paper the finite state machines theory is applied as management method for supercapacitors based uninterruptable power supply (UPS). Design procedure is discussed in detail. Finally, the simulation and experimental results are provided to verify the design. View full abstract»

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  • A quasi-3D simulation for high-voltage level-shifting circuit by divided RESURF structure

    Page(s): 73 - 76
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (391 KB) |  | HTML iconHTML  

    A new quasi-3D simulation technique to verify the high-voltage level-shifting circuit by divided RESURF structure is proposed. It simulates the 3D performances of the structure by combining the devices paralleled to plane x-y and plane y-z with the circuit analysis advanced application module of Medici. The punch-through effect and parasitic n-MOST effect in the structure are analyzed and simulated. The results prove that only the parasitic n-MOST has been developed in this structure. The optimized parameters of the divided RESURF structure can be proposed to suppress the parasitic n-MOST effect. The quasi-3D simulation technique has many merits, such as computing quickly, no demand on the high-end computer terminals and operating easily. View full abstract»

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  • Application of superconductor in ELF communication

    Page(s): 77 - 80
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    ELF communication is linked up with superconductor technological in this paper. The advantage of receiving superconductor antenna, which is applied to replace the existing submarine communication antenna, as well as current technology difficulties are together introduced in particular. It is also pointed out in the paper that, along with the development in superconductor sector, the application area of superconductor antenna is promising. View full abstract»

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  • Design and analysis of a linear induction motor for a prototype HTS maglev transportation system

    Page(s): 81 - 84
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (224 KB) |  | HTML iconHTML  

    This paper investigates the design and analysis of a linear induction motor (LIM) drive for a prototype transportation system, which is levitated by the interaction force between high temperature superconducting (HTS) bulks placed on the ground and permanent magnets (PMs) mounted on the bottom of the vehicle, while the driving force is provided by a linear induction motor system on the side of the prototype vehicle. An equivalent electrical circuit is applied to predict the motor characteristics and the computation results show that the proposed LIM drive system is appropriate for driving the HTS maglev transportation prototype. View full abstract»

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  • Design and characteristics analysis of long-primary single-sided linear induction motor

    Page(s): 85 - 88
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (446 KB) |  | HTML iconHTML  

    Long-primary single-sided linear induction motors (SLIMs) have unique advantages in some applications such as an electromagnetic launcher with higher force density and acceleration due to its lightweight secondary conductive sheet compared with other types of SLIM having different structures. Furthermore, long-primary SLIM will have superiorities without any friction loss and guidance control system when it is combined with high temperature superconducting (HTS) magnetic levitation system. In this work, a long-primary SLIM integrated with HTS levitation system is designed. This paper presents the design and performance analysis of the SLIM levitated by a HTS levitation system, and the magnetic field finite element method is applied to analysis its magnetic flux distribution, thrust force and normal force characteristics with results obtained. Finally, the preliminary motor running testing results are also presented. View full abstract»

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  • Optimization design of microchannel heat sink based on SQP method and numerical simulation

    Page(s): 89 - 92
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    Taking the minimum thermal resistance as objective function, a nonlinear, signal objective and multi-constrained optimization model was proposed for the microchannel heat sink in electronic chips cooling. The sequential quadratic programming (SQP) method was used to do the optimization design of the structure size of the microchannel. For the heat sink to cool a chip with the sizes of 12 mm times 12 mm and the power of 400 W, the microchannel number is 29, the width and the height of microchannel is 200 mum and 1800 mum, respectively. The distance from the chip surface to the base of microchannels is 200 mum and the width of the fin is 200 mum. Its corresponding total thermal resistance is 0.2628degC/W. The numerical simulation results show that the heat transfer performance of microchannel heat sink is affected intensively by its dimension. Comparing with the other heat sink, the highest temperature of the optimal dimension heat sink is diminished about 16.48degC when they have the same microchannel heat transfer area. View full abstract»

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