Design and Experiment of a New Maglev Design Using Zero-Field-Cooled YBCO Superconductors

IEEE Trans. Appl. Supercond.

et al. 2017

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.

Section: B the Zfc-smb Computer Aided Design Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

IEEE Trans. Appl. Supercond.

et al. 2017

“…In previous work [7,8], an original ZFC Maglev vehicle was proposed, simulated and tested. Using similar principles, an original SMB was projected and simulated.…”

Section: Previous Workmentioning

confidence: 99%

Conception of a YBCO superconducting zfc-magnetic bearing virtual prototype

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

et al. 2016

Abstract-This paper presents the conception of an original superconducting Frictionless Zero Field Cooling bearing virtual prototype. In previous work also shown in this conference, a viability study of a Zero Field Cooling-superconducting bearing concept was conducted. It showed that the virtual prototype is feasible. Moreover, the simulation studies showed that a Zero Field Cooling superconducting track provides not only effective lateral stability but also higher levitation forces than the commonly used Field Cooling tracks. In this paper the new Zero Field Cooling -bearing virtual prototype is modeled in 3D. The virtual prototype was designed having in mind: i) a future implementation in high density polyurethane, for low temperature robustness; ii) future manufacturing in a three axes CNC milling machine and; iii) future implementation of some parts using an additive manufacturing technique.

“…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

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

et al. 2016

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.