Zhengwei Zhao

Guangdong Ocean University

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Guangtong Ma

Southwest Jiaotong University

Jing Li

Southwest Jiaotong University

Kang Liu

Southwest Jiaotong University

Tianyong Gong

Southwest Jiaotong University

Ruichen Wang

University of Maryland, College Park

Wenjiao Yang

Guangdong Ocean University

Shuai Xu

Changsha University of Science and Technology

Jun Luo

Southwest Jiaotong University

Baozhu Jia

Guangdong Ocean University

Yuanyuan Xu

Guangdong Ocean University

Cooperative Institutions

Southwest Jiaotong University

Shanghai Tunnel Engineering Rail Transit Design & Research Institute

Chinese Academy of Sciences

Huazhong University of Science and Technology

Guangdong Ocean University

Shanghai Jiao Tong University

Harbin Institute of Technology

Xi'an Jiaotong University

Northwestern Polytechnical University

Tsinghua University

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The Establishment of an Analytical Model for Coreless HTS Linear Synchronous Motor With a Generalized Racetrack Coil as the Secondary

IEEE Transactions on Applied Superconductivity (2019)

Zhengwei Zhao Kang Liu Chao Wang Weihai Zhang Jing Li

High temperature superconducting (HTS)-coated conductors show various advantages in practical applications because of its zero resistance and large current capacity. Owing to the superior properties of HTS material in high magnetic fields, the HTS linear synchronous motor (LSM) is able to output high performance at relatively large air gap. Many experiments and prototypes have been implemented, which requires great consumption of HTS-coated conductors. In this paper, an analytical model of coreless HTS LSM was established and the magnetic flux density dependence of the critical current density of HTS-coated conductors was taken into account. An HTS-generalized racetrack coil was introduced to the analytical model for easy parameterization. A small scale prototype of the LSM which has a coreless stator and a HTS secondary was manufactured to validate the analytical model. It is indicated that the calculations have a good agreement with the experiments. As an application of the analytical model, an optimization task of the HTS LSM was carried out to improve its performances.

10.1109/tasc.2019.2901015

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Citations (17)

Studies of the Effect of Copper Layer on Dynamic Characteristics of a Stack-Type HTS Maglev System Based on H-Formulation

IEEE Transactions on Applied Superconductivity (2023)

Wenjiao Yang Guangtong Ma Mingjiang Wang Zhengwei Zhao Baozhu Jia

The study of dynamic characteristics is crucial for the future safe applications of HTS maglev systems. Currently, there is limited research on the dynamic characteristics of stack-type HTS maglev systems, particularly regarding the effect of the copper layer within the coated conductor multi-layer structure on vibrational behavior. This paper fills this research gap. The dynamic responses of a stack-type HTS maglev bearing under different time-varying external excitations are calculated with 3 modes (real-scale (HTS-copper) model, real-scale (HTS) model, homogenized model). It is found that under low-frequency external excitations, the induced currents in the copper layer are too small to significantly affect the vibrational response. However, under high-frequency external excitations, the primary effect of the induced currents in the copper layer is to induce phase delay of the dynamic response. Besides, the results from 3 models indicate that the accuracy of the homogenized model decreases as the external excitation frequency increases. In response to different operating conditions, the suitable modeling approaches are proposed from the perspectives of accuracy and computing time consumption.

Maglev

10.1109/tasc.2023.3343675

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Citations (1)

A novel field-circuit approach for the design and analysis of permanent magnet machines

Shuyun Yang Zhengwei Zhao Xiaolong Gao

A novel field-circuit approach for permanent magnet (PM) machine design and analysis has been developed in this paper. The approach is based on off-line finite element analysis for obtaining flux function curves with designated structure variables of PM machines, such as the thickness of permanent magnet, diameter of stator and rotor, and so on. The curves are then utilized as a database for optimal design and analysis of the PM machines. The approach not only shares the benefits of the field method, such as accuracy and effectiveness, but also maintains the succinctness and quickness of the circuit method. Simulation and experimental results exhibit the validation of the proposed approach.

10.1109/peds.1999.794585

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Citations (0)

Multi-objective Optimization of Superconducting Linear Motor Considering General Racetrack Coils

IEEE Transactions on Applied Superconductivity (2024)

Zhengwei Zhao Wenjiao Yang Zhaoying Yan Baozhu Jia Yuanyuan Xu

Superconducting Coils

Superconducting electric machine

Superconducting wire

10.1109/tasc.2024.3451474

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Experimental and numerical studies of a linear synchronous motor with the secondary made of coated superconductor

CES Transactions on Electrical Machines and Systems (2019)

Kang Liu Xingtian Li Yao Cai Tianyong Gong Zhengwei Zhao

Thrust tests of a linear synchronous motor (LSM) with its secondary made of coated superconducting coils were conducted via the built prototype over the traditional copper windings. A numerical model of the superconducting LSM was made and the measured data of experiment validate its reliability. The nonlinear resistivity of coated superconductor was electromagnetically modeled by resorting to the power law in conjunction with the constitutive relationship of conductor. Based on the numerical model, we carried out a set of transient studies to make a forecast about the superiority of the proposed high temperature superconducting (HTS) LSM, such as magnetic field distribution and the time evolution of thrust together with the speed in different loads and frequencies. The achieved results clearly confirm that the proposed HTS LSM has the advantages to work as a candidate for developing the high-thrust LSM with a large air gap.

Transient (computer programming)

10.30941/cestems.2019.00039

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Citations (3)

Study on the Dynamic Characteristics of superconducting EDS Train with magnet quenched based on a Magneto-Electric-Force Coupled Model

IEEE Transactions on Applied Superconductivity (2024)

Zhaoying Yan Zhengwei Zhao Fan Yang Mingjiang Wang Wenjiao Yang

Magneto

10.1109/tasc.2024.3515001

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Citations (0)

3-D Analytical Model of Racetrack HTS Coil Subject to Travelling Magnetic Fields

Journal of Superconductivity and Novel Magnetism (2020)

Zhengwei Zhao Shuai Xu Kang Liu Wenjiao Yang Jing Li

Maglev

Magnetic Levitation

Counter-electromotive force

10.1007/s10948-020-05684-y

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Citations (7)

The reduced fluctuation in the electromagnetic forces of a coreless HTS linear synchronous motor

Physica C Superconductivity (2018)

Kang Liu Zhengwei Zhao Tianyong Gong Yao Cai Chao Wang

Yoke (aeronautics)

10.1016/j.physc.2018.09.003

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Citations (8)

3-D Analysis of Electromagnetic Forces of a Real-Scale Superconducting Linear Synchronous Motor for EDS Train

IEEE Transactions on Applied Superconductivity (2021)

Zhengwei Zhao Guangtong Ma Kang Liu Zhenhua Su Jun Luo

The superconducting linear synchronous motor (LSM) is considered as one of the most suitable propulsion approaches for the electrodynamic suspension (EDS) train whose operating speed exceeding 600 km/h has been realized. The performance of the superconducting LSM is directly influenced by the multi-degree-of-freedom motion of EDS train. Therefore, it is essential to carry out the characteristic analyses of superconducting LSM to verify its fitness in EDS system. In this paper, the characteristic analysis of superconducting LSM was implemented based on a real-scale 3-D finite element model. The variation trends of thrust force, levitation force and guidance force are investigated to confirm the stability of EDS train in consideration of both the lateral and vertical displacements. The obtained results show that the electromagnetic force of superconducting LSM can provide the excellent thrust force for EDS train, enhance the stability in lateral direction and worsen the stability in vertical direction of EDS train. Those results will be the significant guidance for promoting the application of superconducting LSM in EDS train.

Electrodynamic suspension

Magnetic Levitation

10.1109/tasc.2021.3059390

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Citations (6)

Electromagnetic Optimization of Propulsion Force of a Real-Scale Air Cored Superconducting Linear Motor Applied in EDS Train

Zhengwei Zhao Shuai Xu Kang Liu Tianyong Gong Jing Li

The air cored superconducting linear synchronous motor (LSM) as a key part of the propulsion system of electrodynamic suspension (EDS) system needs to be studied comprehensively to promote the development of EDS. Therefore, the output characteristics of a real-scale air cored superconducting LSM in EDS were studied and optimized in this paper. Firstly, a finite element (FE) model of a real-scale superconducting LSM was established and validated. Afterword, the characteristics of the real-scale superconducting LSM, including open-circuit flux density, armature magnetic field, back-EMF, normal force and thrust were investigated and optimized based on the FE model. The RMS of thrust and normal force were enhanced significantly by the optimization which taken the thickness of primary coils as a variable.

10.1109/icems.2019.8922224

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Citations (6)