Article
Engineering, Electrical & Electronic
Gang Lv, Yaqing Liu, Zhixuan Zhang, Leilei Cui, Ruodong Zhi, Tong Zhou
Summary: The influence of rolling motion and lateral motion on the electromagnetic performance of a combined levitation and guidance EDS maglev train is calculated and analyzed. The coupling mechanism between rolling and lateral motion is discussed, and mathematical models and analytic methods are presented. The variation trends of levitation force, guidance force, and rolling torque with lateral offset after rolling motion occurs are discussed, and the analytical results are experimentally verified.
IEEE TRANSACTIONS ON MAGNETICS
(2023)
Article
Engineering, Electrical & Electronic
Gang Lv, Yaqing Liu, Tong Zhou, Zhixuan Zhang
Summary: In this article, a new magnetomotive force (M.M.F) distribution model suitable for the suspension and guidance system of EDS maglev is proposed by considering the end effect of vehicle coils. The expressions of various output parameters are derived based on the established M.M.F model and the space harmonic method. The results are compared with simulations and experimental data, showing the feasibility and accuracy of the proposed model and analytical method.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Materials Science, Ceramics
Murat Abdioglu, U. Kemal Ozturk, Sait Baris Guner, Mehmet Ozturk, Hakki Mollahasanoglu, Ekrem Yanmaz
Summary: We enhanced the magnetic force efficiency of Maglev systems by dividing YBCO bulks into three slices horizontally and maximizing the YBCO-PMG interaction surface. The levitation and guidance forces were found to be larger when using YBCO in transversal lying mode compared to longitudinal mode.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Gang Lv, Leilei Cui, Ruodong Zhi, Tong Zhou, Yaqing Liu
Summary: This article introduces a new transverse flux linear synchronous motor (TFLSM) for high-speed maglev trains, which can provide propulsion, levitation, and guidance (PLG) forces simultaneously. The electromagnetic characteristics of TFLSM and conventional LSMs are compared using finite-element method (FEM), demonstrating the feasibility of TFLSMs in maglev transportation system applications. Experimental validation is conducted on a prototype TFLSM.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Engineering, Electrical & Electronic
Gang Lv, Zhixuan Zhang, Yaqing Liu, Tong Zhou
Summary: This paper introduces the key technologies of high-speed maglev system, including propulsion, levitation, and guidance (PLG). A novel method combining linear synchronous motor (LSM) is proposed to realize these three functions simultaneously. By analyzing the 3-D electromagnetic forces of LSM, the expressions for propulsion force, levitation force, and guidance force are obtained, and the correctness of the model is verified.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Mechanical
Li Wang, Zigang Deng, Long Kou, Haitao Li, Wuyang Lei, Zhihao Ke, Qingshu Li
Summary: This study investigates the levitation stiffness of the high temperature superconducting maglev train, revealing a linear relationship between stiffness and levitation force. This finding can serve as a reference for engineering applications and dynamic calculations.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Civil
Junxiong Hu, Weihua Ma, Shihui Luo, Wan Liu, Tianwei Qu, Huajun Luo
Summary: The study focused on the decoupling capability of medium-low speed maglev trains levitation frames, finding that oscillation of hanger rods and anti-rolling beams is crucial, while the position of anti-rolling devices and length of hanger rods have minimal impact on the decoupling capability. The maximum roll computed for LFMAS is 2.84mm, meeting the anti-rolling requirement.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2021)
Article
Energy & Fuels
Jiming Chen, Qiang Zhang, Jing Liu, Chongwang Xu, Jingnan Zhu
Summary: Vertical axis wind turbines have poor starting performance, but they have shown great potential in offshore floating wind power generation systems. This paper proposes an asymmetric-primary axial-flux hybrid-excitation generator (APAFHG) to improve the start-up and low wind speed operation capacity of vertical wind turbines. A control strategy is proposed to achieve the decoupled control of the maglev system and generator power by analyzing the levitation force characteristics of APAFHG.
Article
Materials Science, Multidisciplinary
Jun Zheng, Yeying Bao, Wuyang Lei, Xiaoning Liu, Yanxing Cheng
Summary: This study investigated the seed-face orientation of vertical HTS bulks and the maglev performance of single and double YBCO bulks on a Halbach PMG. It was found that the effect of the seed-face orientation on the levitation force was smaller than that on the guidance force. Moreover, the results showed that the maglev performance of two adjacent bulks in vertical arrangements does not simply equal the sum of levitation or guidance forces of the two bulks, indicating the presence of compound effects caused by bulk inhomogeneity and bulk anisotropy.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Multidisciplinary
Jun Zheng, Peng Pang, Peng Wen
Summary: Previous research has shown that the rise in temperature inside high temperature superconducting (HTS) bulk has an impact on its levitation performance. In order to further explore the relationship between internal temperature rise and levitation force, a thermal-dynamic levitation force coupling measurement device was reformed, and Halbach PM wheel was used to generate alternating magnetic field at different heights and speeds. The influence of magnetic field fluctuation on temperature rise and levitation force of HTS bulk was studied. The experimental results can provide theoretical suggestions for the irregularity standard of PMG and reference for the protection of the HTS pinning maglev system.
Article
Engineering, Electrical & Electronic
Ruodong Zhi, Biao Liu, Gang Lv, Leilei Cui, Tong Zhou
Summary: This article proposes a novel transverse flux linear synchronous motor integrated with propulsion, levitation, and guidance functions (PLG). The structure and principle of the motor are discussed, and the air-gap magnetic flux density, propulsion, levitation, and guidance forces are calculated. The calculated results are also validated by experiments, providing electromagnetic theory analysis for electromagnetic suspension transportation integrated with PLG.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2023)
Article
Chemistry, Physical
Yicheng Feng, Jun Zheng, Zigang Deng, Wuyang Lei, Zili Wang
Summary: A double-layer double quasi-Halbach guideway has been designed to reduce dependence on rare-earth materials and lower costs. It utilizes 35% less NdFeB than traditional guideways and maintains comparable levitation and guidance capabilities.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Thermodynamics
Xuanbo Wang, Jun Zheng, Xu Zhang, Kehong Ren, Xiaoning Liu
Summary: This study investigates the effect of different pumping sequences under low pressure on the levitation and guidance performance of YBCO bulks in a high temperature superconducting Maglev-evacuated tube transport system. The results show that the sequence of evacuating and then levitating is more suitable for achieving a larger levitation force, while the sequence of levitating and then evacuating is more suitable for a larger guidance force. These findings can provide valuable references for the practical startup procedures and future engineering design of HTS Maglev-ETT systems.
Article
Engineering, Electrical & Electronic
Gang Lv, Leilei Cui, Ruodong Zhi, Zhixuan Zhang
Summary: This article presents an improved structure of the transverse flux linear synchronous motor (TFLSM) to simultaneously realize the propulsion, levitation, and guidance functions of a maglev train using only one electromagnetic device. The topological structure and operating principle of the TFLSM are analyzed, and a three-dimensional analytical model is proposed, providing the analytical expressions for inductance and electromagnetic forces. The 3-D force characteristics of the TFLSM are then calculated under different operating conditions, and the theoretical analysis results are compared with experimental data to validate the effectiveness and accuracy of the analytical method.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Wei Hong, Ying Xin, Changqi Wang, Ning Li
Summary: This article proposes a novel quasi-static measurement method for lateral disturbance in HTS maglev, which improves upon existing static methods and has great compatibility for different magnetic guideway units and levitation parts. By using this method, the real levitation situation can be measured comprehensively for performance optimization of HTS maglev.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)