Stability of the Maglev Vehicle Model Using Bulk High Tc Superconductors at Low Speed

Zheng, Jun; Deng, Zigang; Wang, Lulin; Liu, Lu; Zhang, Ya; Wang, Suyu; Wang, Jiasu

doi:10.1109/tasc.2007.898388

Cited by 51 publications

(24 citation statements)

References 11 publications

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“…The profile in Figure 3 and Figure 4 were very similar due to the force was caused by the interaction between the induced current and applied field. The force oscillation could affect levitation performance and cause vibrations [7] of the free levitation body, but we focus on the general tendencies of the levitation force behavior in this paper. …”

Section: Dynamic Force Measurementmentioning

confidence: 99%

Levitation Force Transition of High-Tc Superconducting Bulks above a Spinning Permanent Magnetic Guideway

Liu¹,

Li²

2016

Proceedings of the 2016 Joint International Information Technology, Mechanical and Electronic Engineering

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Abstract. In practical application of a High-Tc Superconducting (HTS) maglev vehicle, the onboard HTS bulks are inevitably exposed to a varying inhomogeneous field due to present processing and assembling technology of the permanent magnetic guideway (PMG). To explore the influence on the levitation forces of YBa 2 Cu 3 O 7-x bulk samples in such changing external magnetic field due to different traveling speeds, we experimentally investigated the general transition of said levitation force under such varying external field simulated by a spinning circular PMG. The force waves general attenuated caused by AC loss brought by magnetic field fluctuating. For further information on that levitation dynamic equilibrium, we study experimentally the wave detail and general transition of the dynamic levitation force under different steady velocities between 0 and 120 km/h. Ultimately the results indicated that the attenuation saturated rapidly in higher speed that would be of benefit to the HTS-PMG system in long-term operating.

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Section: Dynamic Force Measurementmentioning

confidence: 99%

Levitation Force Transition of High-Tc Superconducting Bulks above a Spinning Permanent Magnetic Guideway

Liu¹,

Li²

2016

Proceedings of the 2016 Joint International Information Technology, Mechanical and Electronic Engineering

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“…Contrary, the zero-field-cooling technique consists in cooling a superconductor in the absence of magnetic fields. When a ZFC superconductor bulk is positioned in the middle of an existing magnetic field, it is repealed to a position where the magnetic flux is nearly zero [3,4]. Majority of existing levitation systems use PMs on one part and FC superconductor bulks on the other part, being used as frictionless rotating bearings that can be horizontal or vertical axis rotating [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Experimental Setup and Efficiency Evaluation of Zero-Field-Cooled (ZFC) YBCO Magnetic Bearings

Arsenio

Carvalho

Cardeira

et al. 2017

IEEE Trans. Appl. Supercond.

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Abstract-This paper presents the conception, simulation and experimental evaluation of magnetic bearings based on NdFeB magnets and zero-field-cooled (ZFC) YBCO bulk superconductors to replace the bearings of a standard electric machine. Advanced research on HTS magnetic levitation has been carried out for the construction of large scale flywheels or for industry applications. However, those approaches used fieldcooled (FC) superconductors, whereas the approach shown in this paper uses ZFC superconductors. Actually, as previously shown by the authors, ZFC implementation presents much less AC losses. The approach in our horizontal flywheel research follows the ZFC-maglev structure, where the linear track was closed into a circular one with the same diameter of the superconductor magnetic bearing. The conception and geometric placement of magnets and superconductors was designed to keep symmetry along the rotating axis and minimizing air gaps. A 3D finite element model was built for simulation and validation of the effectiveness of the solution. Experimental validation was then achieved measuring the balanced and unbalanced rotor lifting and guiding forces.

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“…When a zero field cooled superconductor bulk is positioned in the middle of an existing magnetic field it is repealed to a position where the magnetic flux is nearly zero [4,5]. Hence, levitation systems can be ZFC or FC [6,7].…”

Section: Introductionmentioning

confidence: 99%

Viability of a frictionless bearing with permanent magnets and HTS bulks

Arsenio

Carvalho

Cardeira

et al. 2016

2016 IEEE International Power Electronics and Motion Control Conference (PEMC)

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Abstract-This paper studies the technical viability of a frictionless rotating bearing model comprising one inner rotor part with discontinuous rings with permanent magnets and one outer stator part with discontinuous rings with high temperature superconducting bulks, distributed on a geometric arrangement that guarantees enhanced levitating and guidance forces using the zero field cooling technique. Extensive Finite Element model simulations were carried out to estimate levitation and guidance forces depending on the air gap dimensions. Eccentricity and axial displacement of the rotor are estimated depending on the external radial and axial forces applied to the rotor. Finally, the proposed design of a viable and feasible frictionless bearing prototype is foreseen.

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Stability of the Maglev Vehicle Model Using Bulk High Tc Superconductors at Low Speed

Cited by 51 publications

References 11 publications

Levitation Force Transition of High-Tc Superconducting Bulks above a Spinning Permanent Magnetic Guideway

Levitation Force Transition of High-Tc Superconducting Bulks above a Spinning Permanent Magnetic Guideway

Experimental Setup and Efficiency Evaluation of Zero-Field-Cooled (ZFC) YBCO Magnetic Bearings

Viability of a frictionless bearing with permanent magnets and HTS bulks

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