A5073160845- Physics of Superconductivity and Magnetism
- Magnetic Bearings and Levitation Dynamics
- Superconducting Materials and Applications
- Electric Motor Design and Analysis
- Frequency Control in Power Systems
- Multilevel Inverters and Converters
- Electromagnetic Launch and Propulsion Technology
- Advanced DC-DC Converters
- Superconductivity in MgB2 and Alloys
- Magnetic and transport properties of perovskites and related materials
- Silicon Carbide Semiconductor Technologies
- Sensorless Control of Electric Motors
- Railway Engineering and Dynamics
- Microgrid Control and Optimization
- Particle accelerators and beam dynamics
- Magnetic Properties and Applications
- Tribology and Lubrication Engineering
- Electrical Contact Performance and Analysis
- Railway Systems and Energy Efficiency
- Wireless Power Transfer Systems
- Induction Heating and Inverter Technology
- Machine Fault Diagnosis Techniques
- Magnetic properties of thin films
- Advanced Algorithms and Applications
- Magnetic Field Sensors Techniques
Southwest Jiaotong University
2015-2025
Shanghai Tunnel Engineering Rail Transit Design & Research Institute
2019-2024
Chengdu University of Technology
2012
Model predictive control (MPC) has become one of the most attractive techniques due to its outstanding dynamic performance for permanent magnet synchronous motor (PMSM) drives. However, tuning weighting factors cost function MPC is a time-consuming procedure and can significantly affect torque ripples PMSM For purpose optimizing in functions MPC, this article proposes an artificial neural network (ANN) based method, which applies genetic algorithm as back propagation algorithm. Since method...
Superconducting electrodynamic suspension (EDS) train has the unique advantages of excellent levitation and guidance stabilities, large gap, so on. All these merits make it a promising candidate for future ultrahigh-speed transportations. In order to explore dynamic characteristics EDS system with figure-eight-shaped coil (ground coil), this article transforms complex electromagnetic field coupling between superconducting magnets ground coils into reduced circuit relationship based on...
Abstract Insulation coating is a sought after technique for REBa 2 Cu 3 O 6+ x (REBCO) based high temperature superconducting tapes in practical applications. In this work, we developed novel preparing ultra-thin and fully surrounded insulation coatings on REBCO tapes. This completely eliminates the risk of critical current degradation induced by curing, without sacrificing mechanical performance engineering density. We adopted CRC-PLASTICOTE-70 as precursor verified its at 77 K. Thickness...
In order to improve the cost performance of present high-Tc superconducting (HTS) Maglev vehicle system for practical application, multi-pole permanent magnet guideway (PMG) concept was introduced. A well-known double-pole Halbach PMG chosen as a representative PMGs compare with traditional monopole from point view levitation efficiency and cost. Experimental results show that YBCO bulks above can exhibit better load capability guidance well dynamics stability at applied working height...
Three superconducting stacks made of 120 REBCO coated conductor tapes were each fabricated and assembled to obtain several modules. Their levitation responses over two different permanent magnet (PM) guideways investigated by experiment finite element simulation. For the experiment, a test rig was developed that can measure force in three directions for any given relative movement between PM guideway. simulation, 2D H-formulation adopted. To treat high aspect ratio tapes, an anisotropic...
Brushless modular spoke type permanent magnet (MSTPM) machine has exhibited prior electromagnetic (EM) performance over conventional surface-mounted PM machines for in-wheel traction system in electric vehicles (EVs). However, analysis of thermal behavior MSTPM is rather insufficient, even accurate significant importance due to poor heat dissipation condition inside the wheel hub. Conventionally, losses produced electrical by EM prediction equivalent source normal analysis, and only...
Finite control set model predictive (FCS-MPC) shows superior dynamic performance with simple structure for motor drives. However, conventional FCS-MPC method presents unfixed switching frequency, making it intractable the design of heat sinks and output filters. To address this issue, article is devoted to developing a new strategy constant frequency permanent magnet synchronous (PMSM) drives fed by three-level T-type inverter. The regulation realized extending period technique, where...
Conventional neural network (CNN) has been extensively applied in the field of fault diagnosis for multilevel inverter. However, most CNN based diagnostic strategies are typically implemented offline. To accomplish precise and online open-circuit (OC) three-level active neutral-point-clamped (3L-ANPC) inverter, trained is deployed into an edge computation board. Furthermore, this letter utilizes TensorRT to facilitate lightweight design CNN, thereby accelerating speed. In order simplify...
We devised a transverse flux linear motor (TFLM) that uses the superconductor-aluminum hybrid as secondary to explore potentials of integrating propulsion with levitation and guidance, which are generally separated in existing magnetic (MAGLEV) systems. In this proposal, is made aluminum plate close-ended coated superconductor coils, latter placed over former achieve stable self-propulsion. To validate analytical formulations for describing electromagnetic responses such were established,...
A high temperature superconducting (HTS) linear synchronous motor that uses REBCO-coated conductor as the secondary excitation system was recently demonstrated. Four series-connected coils were fabricated via epoxy impregnation technique and critical current of each coil can be retained by a percent over 75% at 77 K after winding. Meanwhile, three-dimensional (3-D) finite-element model established to describe coated superconductor subject traveling magnetic fields conventional copper-based...
The modeling of superconducting magnetic bearing (SMB) is great significance for predicting and optimizing its levitation performance before construction. Although lots efforts have been made in this area, it still remains some space improvements. Thus the goal work to report a flexible, fast trustworthy H-formulation finite element model. First methodology calibrating both bulk-type stack-type SMB summarized. Then effectiveness simulating SMBs 2-D, 2-D axisymmetric 3-D evaluated by...
Superconducting electrodynamic suspension (EDS) train has become a suitable candidate for the future ultra-high-speed ground transportation because of its unique advantages self-stability and guidance performances, large gap, high suspension/drag ratio. It is indispensable to develop an efficient electromagnetic modeling method EDS train. An analytical model based on dynamic-circuit theory virtual displacement been proposed, but it know exactly mutual inductance between on-board magnet coil...
Abstract Numerical simulation is an effective tool for predicting the electromagnetic behavior of superconductors. Recently, a finite element method-based model coupling T - A formulation with electrical circuit has been proposed: presents superconducting constituent as global voltage parameter in circuit. This allows assessing overall complex high-temperature superconductor (HTS) systems involving multiple power items, while keeping high degree precision on presentation local effects. In...
Artificial neural network (ANN) has recently been considered in weighting factors (WFs) optimization for finite control-set model predictive control (FCS-MPC). However, the training of traditional ANN is complicated and accuracy limited by gradient vanishing. For this motivation, article proposes a WFs method based on an aggregated residual (ResNet), which combines advantages connection transformation. Specifically, avoids vanishing while transformation simplifies procedure. Furthermore,...
This article proposes a novel open-circuit (OC) fault diagnosis method for three-level active neutral-point-clamped (3L-ANPC) inverter. is integrated in the receding optimization of model predictive control (MPC), where current built to estimate vector under normal and switch OC fault-assumed conditions. The residual between measured utilized distinguish faulty module. Owning iterative MPC, can be calculated within each interval, thus achieving fast online diagnosis. Besides, count function...
In order to design high temperature superconducting (HTS) maglev launch system, three NdFeB permanent magnetic guideways (PMGs) are investigated and compared for the better levitation forces guidance forces. The laboratory-scale HTS system was designed developed successfully in Applied Superconductivity Laboratory (ASCLab), Southwest Jiaotong University, China. cooling process of melt-textured YBaCuO bulk superconductors is made a big low tube, which connected with PMG. method merit...
Electrodynamic suspension (EDS) train has the unique advantages of excellent levitation and guidance stabilities, large gap, so on. All these merits make it a promising candidate for future ultra-high-speed transportations, in which high-temperature superconducting (HTS) linearly synchronous driving motor (LSM) plays an important role because decrease energy consumption HTS magnet. This paper, serves as fundamental study on system EDS train, is aimed to calculate propulsion force LSM...
High-temperature superconducting (HTS) linear synchronous motor (LSM) with low power loss, high thrust density, and large mechanical gap, makes it a promising candidate for driving the future high-speed rail transit even ultrahigh-speed magnetic levitation (Maglev) vehicle. However, magnet can produce strong enough field, which will inevitably lead to saturation of stator iron generate significantly attractive force between on-board HTS magnet. Therefore, coreless-typed LSM has attracted...
Abstract The coated conductor magnet, as the onboard magnet of electrodynamic suspension (EDS) train, is deemed promising due to its relatively high operating temperature, low cooling cost, and good mechanical tolerance, making liquid-helium-free high-temperature superconducting (HTS) EDS train possible. In order promote progress HTS this work aims at designing, fabricating testing a train. designed with comprehensive considerations electromagnetic calculation, thermal–mechanical coupling...
The mutual inductance is the core parameter of electrodynamic suspension (EDS) as it couples onboard coils and ground to realize stable suspension. precise efficient calculation therefore great significance understand optimize characteristics EDS train, which has achieved a manned speed in excess 600 km/h. In this article, we proposed method inductance, considering geometrical details attitude bogie, by means 3-D discretization spatial coordinate transformation discrete units. Based on...
Hybrid active neutral point clamped (HANPC) inverter has been recently considered in motor drive applications, while its control with multiple objectives remains quite complicated. The finite set model predictive (MPC) is very attractive for multilevel (MLI) drives due to powerful ability handle multiobjective optimization. However, tuning the weighting factors (WFs) MPC challenging and time costing. In this article, a WF-less method HANPC inverter-fed permanent magnet synchronous (PMSM)...
Abstract A parallel-wound no-insulation (PWNI) high-temperature superconductor (HTS) coil is a kind of pancake-shaped (NI) wound with parallel-stacked HTS tapes, which combines the characteristics NI and non-twisted stacked-tape cable. It shows significant advantage in accelerating ramping response compared traditional coils by single tape, promising alternative for large-scale high-field magnets. The stacked cable approach can lead to current redistribution between parallel tapes during...
Experimental data reveal that the classical description of transport ac losses in high-temperature superconducting (HTS)-coated conductors (CCs), based on investigations at low frequencies, is incomplete some aspects when currents kilohertz range are considered. More specifically, above a certain “transition frequency,” per cycle no longer increase with frequency as theory predicts. Using finite element model to allow for loss separation, we find this phenomenon caused by combination several...