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This paper described the design and implementation procedure of Transmission Control Protocol (TCP) hardwiring and TCP offloading engine based on Field Programmable Gate Array (FPGA). The design consists of several modules, and the connection among modules is implemented by buses. The result shows that some functions are realized in this design. The most contribution of this paper is that the design...
In this paper, a step-shaped field coil for large capacity superconducting motors application is investigated. As compared to a conventional rectangular cross-sectional shaped field coil, the step-shaped one can obtain the same air gap magnetic field intensity at a target point located at symmetry axis of field coil with reduced HTS tape consumption, and it also improves the critical current significantly...
Cryogenic operation of power electronics provides many promising benefits for power conversions compared to their ambient-temperature counterparts. This paper presents a cryogenic boost-buck chopper integrated with cryogenic MOSFETs and high temperature superconducting (HTS) inductor. The results obtained show that the proposed boost-buck chopper has much higher operational efficiency than the conventional...
HTS materials have potential applications in building HTS linear generators (HTSLG) which generate substantial advantages over conventional ones. A HTS linear synchronous generator (HTSLSGs) with HTS coils as a direct-drive wave energy converter (DWEC) is proposed and designed. The characteristics, structures, advantages of the HTSLSGs with HTS coils are analyzed and presented.
An inductive coupled power transfer (ICPT) scheme using high temperature superconducting (HTS) primary is presented, with its resonant current, transfer power and transfer efficiency characteristics calculated and discussed to identify this promising method to suit to develop practical low-frequency high-current ICPT devices and systems.
A conceptual cryogenic system for a 10 MW superconducting wind generator (SWG) is proposed. The proposed configuration eliminates the cryogenic rotary joints for transmitting the coolant, by which the reliability of the cryogenic system is improved. The design considerations and characteristic analysis under different conditions are conducted. The characteristic analysis provides a base for practical...
As an important part of the High Temperature Superconducting (HTS) cable system, the stability and reliability of cryogenic system are the key to successful commercial application for HTS cables. A cryogenic refrigeration system combined of open and closed refrigeration for 35 kV/2000 A HTS cables has been developed. The system passed its trial run after site installation, and was put into operation...
Despite intensive research in the field of applied superconductivity only now we start to use of this phenomenon for the most obvious application, namely, power transmission. At present, it can be seen an explicit shift from AC to DC HTS cable systems due to the many advantages of the DC ones. However, even at constant current transmission line is subjected to current fluctuations and, consequently,...
In this study, an inductance measurement method by electrical method are originally suggested for a 22.9 kV/50 MVA high temperature superconducting (HTS) cable with a conductor and a shield. Using this method, we experimentally evaluate self-inductances of the conductor and shield, respectively, and also their mutual inductance. To verify the measured data, the self and mutual inductances of the conductor...
This paper introduces a development of CD HTS cable control system and the practical situation of project, in which the redundancy architecture and multiple security mechanism are taken, all those measures can effectively improve the reliability of the whole system.
Quantum phase transitions are studied by solving the modified Bogoliubov de Gennes (BdG) model for mesoscopic metallic superconductor with large surface scatterings. It is found that the nonlocal surface scattering effect can be mapped as a spin-orbit interaction into the model Hamiltonian, which exerts an effective magnetic field of opposite orientation for opposite spin electrons. Spin chiral states...
In order to investigate the magnetic property of material for scaled-down experiments on electric machines, numerical modeling on the power and loss densities of scaled-down laminated cores is studied in this paper. To reduce computational cost, the laminated core is modeled combining a 3D solid core analysis with a 1D steel plate analysis The hysteresis loss, eddy current loss, iron loss and power...
Vernier permanent magnet (VPM) machines are obtaining more and more attentions due to their high torque density and low torque ripple in recent years. However, they suffer from low power factor compared with conventional PM machines. In this paper, a triple-rotor axial-flux spoke-array vernier permanent magnet (TR-AFSAVPM) machine is proposed to improve the power factor of conventional VPM machines...
In this paper, an operating parameters optimization method for SMES considering transient thermal stability is proposed. Firstly, based on the analysis of transient thermal characteristics of SMES, a neural network based transient thermal analysis model is established to test the transient thermal stability of SMES for particular application scenarios. Then, based on the proposed model, a procedure...
A new type of PM brushless caw pole motor (CPM) with soft magnetic composite (SMC) core is presented and analyzed in this paper. The rotor field of the CPM is generated by the PM mounted on the caw pole surface, the three-phase stator windings are fed with variable-frequency three-phase AC currents. The advantages of the proposed CPM are that there are no slip rings on the rotor, and it can achieve...
High-quality Tl-2212 superconducting films were prepared on CeO2 coated r-cut sapphire substrates. An in situ two-temperature deposition process was introduced in the growth of CeO2 buffer layers. XPS measurements showed that the deposition process can sharply decrease the mutual diffusion at the interface. The critical temperature Tc of Tl-2212 film grown on the buffer layer was 108.2 K, the critical...
The low-temperature variations of the thermal expansion coefficient α(T) of a non-superconducting PrBa2Cu3O6+x ceramic in two states of oxygenation, x = 0.44 and 0.95 are reanalyzed using the α(T)/T and a(T)/T2 versus T representations. Below the Neel temperature TN of the Pr antiferromagnetic ordering which increases respectively from 9 to 14 K, two anomalies are observed. The first one is located...
The characteristic of the driving torque generated by the superconducting motor is analyzed. The magnetic field distribution of the stator coils and the driving torque at the different position are calculated by FEM software. According to the rotation position detected by the fiber optic sensor measurement system, the motor can drive the rotor accelerating or decelerating rotation conveniently by...
The electrical jointing of superconducting wires / tapes is a key issue for the construction of the scientific superconducting magnet that required high field stability, such as NMR, FTICR-MS and some inertial navigators. In this paper, the preliminary experiment of electromagnetic formed NbTi superconducting joint was done. The fabrication technique was researched by changing the parameters. The...
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