Levitation force and guidance force of YBaCuO bulk in applied field

Wang, X.R.; Song, Honghai; Ren, Zhongyou; Zhu, Minhao; Wang, J.S.; Wang, S.Y.

doi:10.1016/s0921-4534(02)02159-7

Cited by 26 publications

(14 citation statements)

References 11 publications

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“…T of the C sample is 157.4% and 127.43%. As we know, at the same measure height, the GF increases when the decrease of the field cooling height is due to the increase of the trapping magnetic field [10]. In the procession of the pre-load cases, the HTS traps more magnetic flux, so the GF increases.…”

Section: Discussionmentioning

confidence: 83%

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Characteristic of the Guidance Force in the High-T c Superconducting Levitation System with Pre-Load Process

Lin

Deng

et al. 2009

J Supercond Nov Magn

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The stable levitation above permanent magnet is an important characteristic of the bulk high-T c superconductor (HTS). When an external force pushes the bulk HTS up, down or sideways, or tries to tilt it, a restoring force can return it to its initial position. The HTS Maglev relied on this characteristic can overcome the external force from wind or pass the curve lines successfully. The change of guidance force (GF) during many times lateral movement is studied. Experiments show that GF increases during the lateral movement, no matter what kind of PMG or HTS is used, and the change of the GF slows down after 5 times lateral movement. The pre-load method can reduce the levitation force decay during lateral movement. So the influence of GF by the pre-load method is needed to be studied. It is found that the pre-load method can increase GF and reduce the change of the GF during lateral movement. The Halbach permanent magnetic guideway (PMG) can offer much more GF but the change is larger just as the levitation force decays. The GF of cylindrical bulk HTS increases more than of the rectangular bulk HTS in the pre-load case. The characteristics of the GF during the lateral movement are explained. These results are important for further HTS Maglev vehicle system designs.

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Section: Discussionmentioning

confidence: 83%

“…1. The structure of PMG1 is similar to the PMG which was used in the first HTS Maglev system in the world [9][10][11][12]. PMG2 is named as Halbach PMG, and produces sinusoidal magnetic field on one side while a minimal field on the other side [13].…”

Section: Methodsmentioning

confidence: 99%

Characteristic of the Guidance Force in the High-T c Superconducting Levitation System with Pre-Load Process

Lin

Deng

et al. 2009

J Supercond Nov Magn

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“…Especially, high nonlinearity of the E-J relation, electromagnetic coupling characteristics and anisotropic property of HTS materials make the theoretical researches on the HTS Maglev vehicle system very difficult. In the theoretical research, Wang Xiaorong built a 2D analysis model based on the Prigozhin model, studying the influence of all kinds of factors of a high temperature superconducting levitation system on the guidance force when the superconductor moves along a horizontal direction over a permanent guideway [6]. Wang Suyu et al researched the levitation force and guidance force of the whole vehicle by the numerical method and it fits well with experimental results [7].…”

mentioning

confidence: 76%

Numerical Study of the Curve Route Levitation Performance of the HTS Bulk over NdFeB Guideway

Qin

2011

J Supercond Nov Magn

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The passive levitation has a self-adjust characteristic to adapt to environmental changes. Levitation Height (LH) or Lateral Displacements (LD) of the high-temperature superconducting (HTS) Maglev vehicle, running over Permanent Guideway (PMG), will change respectively or synchronously due to some external reasons, which caused the vehicle move a certain distance in vertical direction (Y direction) or horizontal direction (X direction) according to a line space route curve along Y or X direction, or random route lying in a XY plane which is perpendicular to the vehicle running direction (Z direction) corresponding to a complicated space route curve. In these cases, how are the levitation performances of the HTS bulk? From a simplest space line route, this paper studied computationally the curve route levitation performance of the HTS bulk which is subject to a PMG applied field. Results show that the change of the levitation and guidance force is different when the HTS bulk moved along line space route. This provides important scientific theories for the numerical simulation of HTS Maglev vehicle.

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“…Wang et al studied the guidance force of the 'Century' manned HTS vehicle under different quasi-static operating conditions [19]. Wang et al studied the levitation force and guidance force of a YBCO bulk superconductor above two parallel NdFeB guideways [20], with the results showing that the guidance force exhibits considerable hysteresis, and is influenced significantly by both the trapped flux in the sample and by the applied field. Dias et al found in a study of the lateral force in a field-cooled superconducting linear bearing [21,22] that the equilibrium position in the lateral direction is affected by motion in this direction.…”

Section: Introductionmentioning

confidence: 99%

Dynamic guidance performance of GdBaCuO and YBaCuO bulk single grain superconductors under a varying external magnetic field

Huang¹,

Ye²,

Lei³

et al. 2022

J. Phys. D: Appl. Phys.

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High temperature superconducting (HTS) maglev technology has attracted considerable attention from researchers around the world. It provides a new direction of development for urban rail and high-speed rail transit due to its considerable advantages of frictionless transportation, low noise, and environmental protection. HTS bulk materials are able to provide a significant performance advantage to maglev technology and are a key component to achieving both levitation and vehicle guidance. HTS bulk samples with enhanced flux pinning characteristics can enable improved curve negotiating ability and lateral stability for the maglev vehicle. This paper reports the results of experiments on the dynamic guidance force of single grain Y-Ba-Cu-O (YBCO) and Gd-Ba-Cu-O (GdBCO) bulk HTS single grains in order to explore their potential for enhanced maglev guidance performance. A customized HTS maglev dynamic measurement system (SCML-03) with a rotating, circular permanent magnet guideway (PMG) was employed to simulate the dynamic operation of the HTS vehicle above the PMG at different translational speeds. It was observed from the experimental results that the GdBCO bulk superconductor is more able to resist the attenuation of the dynamic guidance force compared to YBCO under the same operational conditions. In addition, the GdBCO bulk single grain is more able to return to the original equilibrium position following exposure to an external displacement. It is concluded that the GdBCO bulk single grain offers greater potential than YBCO for practical application in HTS maglev given its enhanced guidance performance. The results of these tests provide an important benchmark for the future design of HTS maglev systems.

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Levitation force and guidance force of YBaCuO bulk in applied field

Cited by 26 publications

References 11 publications

Characteristic of the Guidance Force in the High-T c Superconducting Levitation System with Pre-Load Process

Characteristic of the Guidance Force in the High-T c Superconducting Levitation System with Pre-Load Process

Numerical Study of the Curve Route Levitation Performance of the HTS Bulk over NdFeB Guideway

Dynamic guidance performance of GdBaCuO and YBaCuO bulk single grain superconductors under a varying external magnetic field

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