Magnetic Levitation Characteristics of HTS Bulk Above Electromagnets

Zhao, Chaoqun; Xin, Ying; Hong, Wei; Wen, Yuyan; Li, Jing; Jin, Hui

doi:10.1109/tasc.2019.2960232

Cited by 7 publications

(5 citation statements)

References 28 publications

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“…It is worth noting that both the levitation and guidance forces increased after the current was increased, which could enhance the stability of HTS maglev system using EMGU. This is because the levitation force decreases when the superconductor experiences reciprocating lateral movements [21,25]. Meanwhile, a restoring force (guidance force) is needed when the superconductor is moved laterally.…”

Section: B Levitation Force Due To Emgu Pre-magnetization and Re-magmentioning

confidence: 99%

“…In principle, the EMG also can adopt a segmented instant excitation (SIE) mode to realize a minimum levitation power loss when the train body moves above the EMG, as well as sufficient levitation force and guidance force. In other words, exciting the EMGUs in the area where the train body is currently located and then powering them off once the train body has passed by [24,25]. The EMG can be formed by the arrangement of multiple electromagnetic guideway units (EMGUs).…”

Section: Introductionmentioning

confidence: 99%

“…For this study, an EMGU that allows the formation of an EMG with small or no gap between EMGUs was designed [25][26][27][28]. The levitation force vibrates if the superconductor experiences an inhomogeneous magnetic field along the guideway [29] and the levitation characteristics and performance are closely related to the transverse magnetic field.…”

Section: Introductionmentioning

confidence: 99%

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Electromagnetic and Levitation Characteristics of a High-Temperature Superconducting Bulk Above an Electromagnet Guideway

2020

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An electromagnet guideway unit (EMGU) that can form an electromagnet guideway (EMG) with only a small gap, or even no gap, between multiple EMGUs was designed. The magnetic characteristics of such EMGU(s), including the homogeneity of the magnetic field along the EMGU(s) and the transverse magnetic field distribution were first investigated. As expected, the EMGU(s) can provide a homogeneous magnetic field in order to levitate bulk superconductors. Simulation results from an EMGU model implemented in COMSOL Multiphysics were verified using experimentally measured data, which indicated the established model can be used for further study and analysis. Next, the levitation characteristics of a hightemperature superconducting (HTS) bulk above the EMGU, including the levitation force acting on HTS bulk due to its interaction with the EMGU, as well as the stability of the bulk when experiencing a lateral disturbance and when varying the current of the EMGU, were investigated through experiment and simulation. The behavior of the levitation force during re-magnetization of the EMGU indicated that a larger remagnetizing current is needed to suppress the internal magnetic field (trapped field) obtained from the premagnetization process, thereby providing a repulsive force to the superconductor. The stability study showed that the HTS maglev system with an EMGU with adjustable current can not only deal with a reduction of the levitation force but can also increase the restoring force when the superconductor is disturbed laterally. Finally, in order to clarify the mechanism of these levitation characteristics, the internal electromagnetic characteristics of HTS bulk were analyzed using a 2D model.

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Section: B Levitation Force Due To Emgu Pre-magnetization and Re-magmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electromagnetic and Levitation Characteristics of a High-Temperature Superconducting Bulk Above an Electromagnet Guideway

2020

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“…In principle, on the premise of the superconductor having sufficient levitation force and guidance force, the EMG can adopt a segmented instant excitation (SIE) mode to achieve a minimum levitation power loss. The SIE mode is to energize the EMGUs below the position where superconductors reach, and reduce the current or even power off the EMGUs below the position where superconductors have travelled past [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of a YBCO Bulk Above an Electromagnet Guideway

Zhao

Ainslie

et al. 2021

IEEE Trans. Appl. Supercond.

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For high-temperature superconducting (HTS) maglev, an electromagnet guideway unit (EMGU) that can form an electromagnet guideway (EMG) with a small gap, or even no gap, between EMGUs has been designed. The longitudinal magnetic fields along a single EMGU and two EMGUs arranged in a line were first investigated through measurement and simulation. The experimentally measured data validated the simulation results from a three-dimensional (3D) EMGU model implemented in COMSOL Multiphysics, indicating that the model is reliable and can be used for further studies. The dynamic responses of a high-temperature superconducting (HTS) bulk above a single EMGU and two EMGUs arranged in a line, including the dynamic levitation force (LF) and traveling directional force (TDF), under different operating conditions were investigated through experiment and simulation using a segregated Hformulation model. The magnetic field and current density distributions inside the superconductor are affected by the external magnetic field generated by the EMGU and are responsible for the dynamic characteristics. Finally, the segmented instant excitation (SIE) mode was investigated through simulation, which shows it is feasible by coordinating the currents of EMGUs.

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“…In 2019, several studies have been done to explore the introduction of electromagnet as guideway in HTS maglev, its feasibility has been verified in 2020 [15][16][17]. In comparison with permanent magnet guideway, electromagnetic guideway (EMG) has several advantages [15,18]: (a) Magnetic field intensity can be regulated through the exciting current.…”

Section: Introductionmentioning

confidence: 99%

Force analysis of HTS bulk in a reversed magnetic field

Hong

Xin

Wang

et al. 2021

Supercond. Sci. Technol.

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In the study of high temperature superconducting maglev, the analysis of the forces acted on a high temperature superconductor (HTS) bulk is a basic issue, which can directly reflect the levitation and guidance performances of an HTS maglev system. In previous studies, the electromagnetic guideway was verified to be an alternative guideway type for HTS maglev. Recently, we carried out experimental and simulation work to investigate how a field cooled HTS bulk to interact with a reversed magnetic field. An E-type electromagnet is used to generate the required magnetic field. During the field reversing, forces acted on the HTS bulk were measured with a 3D force measuring system. In this paper, the forces on an HTS bulk in a reversed magnetic field are analyzed according to the experimental data and the results of finite element simulation. The magnetized status of a field cooled HTS bulk in a reversed magnetic field is discussed with a two region supposition. The influences of a reversed magnetic field on HTS maglev are summarized. These results may be of great significance not only for further study of HTS maglev, but also for some other applications, such as superconducting magnetic bearing and superconducting magnetic shielding.

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Magnetic Levitation Characteristics of HTS Bulk Above Electromagnets

Cited by 7 publications

References 28 publications

Electromagnetic and Levitation Characteristics of a High-Temperature Superconducting Bulk Above an Electromagnet Guideway

Electromagnetic and Levitation Characteristics of a High-Temperature Superconducting Bulk Above an Electromagnet Guideway

Dynamic Characteristics of a YBCO Bulk Above an Electromagnet Guideway

Force analysis of HTS bulk in a reversed magnetic field

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