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Wang J.,Applied Superconductivity Laboratory ASCLab | Wang J.,National Laboratory for Rail Transit | Wang S.,Applied Superconductivity Laboratory ASCLab | Wang S.,National Laboratory for Rail Transit | And 16 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2011

This year marks the tenth anniversary of the first man-loading high temperature superconducting (HTS) maglev test vehicle "Century" in the world. This report summarizes development advances of major topics related to the HTS maglev vehicle at the Applied Superconductivity Laboratory (ASCLab) at Southwest Jiaotong University (SWJTU). The HTS Maglev measurement systems are described, including the HTS maglev dynamic test system capable of speeds up to 300 km/h. Through these measurement systems, many problems related to the HTS maglev have been studied such as system optimization, stability control, influence from ramp angles, influence from AC field, and investigation of the system's properties at temperatures lower than 77 K. Apart from experimental studies, the 3-D model of the HTS maglev was constructed via two different methods to simulate the Maglev's behavior. © 2011 IEEE. Source


Lin Q.,Applied Superconductivity Laboratory ASCLab | Jiang D.,Applied Superconductivity Laboratory ASCLab | Ma G.,Applied Superconductivity Laboratory ASCLab | Ma G.,Southwest Jiaotong University | And 6 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2012

The mechanical bearing in the cryogenic liquid pump has short working life due to the low temperature environment. For conquering the disadvantage, the radial high temperature superconducting magnetic bearing (HTSB) is designed to be used in the cryogenic pump. The high temperature superconductors (HTSs) in the HTSB are cooled by the cryogenic liquid directly. The introduced cryogenic liquid pump can constrain the heat leakage. The equipment for the kinetic characteristics of the HTSB is introduced, and it can measure the axial forces of the HTS at different rotation speeds. Basic mechanical principle of the rotor of the pump is analyzed. © 2002-2011 IEEE. Source


Liu L.,Applied Superconductivity Laboratory ASCLab | Liu L.,National Laboratory of Rail Transit | Wang J.,Applied Superconductivity Laboratory ASCLab | Wang J.,National Laboratory of Rail Transit | And 13 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2011

In the practical application of a High-Tc Superconducting (HTS) maglev vehicle, the onboard HTS bulks are inevitably exposed to a varying inhomogeneous magnetic field due to limited magnetic field precision during the processing and assembling of the permanent magnetic guideway (PMG). To explore the levitation force of YBa2 Cu3O7-x bulk samples with respect to a PMG in such changing external magnetic fields, we study experimentally the wave detail and general transition of the levitation force at different dynamic operation modes with the aid of a spinning circular PMG. The rotation of the circular PMG simulates translational movement of the superconductor with respect to a PMG and the rotational speed was set under several shift processes for simulating the different running operation speeds of HTS maglev vehicle. The highest linear equivalent experimental speed was 238 km/h. The change in levitation force was almost instantaneous in accordance to the varying of the vertical component of the applied field, and generally attenuated with running time. The saturation behavior after a change in speed was discussed thoroughly. This observed phenomenon is of great importance in the design and application of the HTS maglev system. © 2010 IEEE. Source


Liu L.,Applied Superconductivity Laboratory ASCLab | Wang J.,Applied Superconductivity Laboratory ASCLab | Deng Z.,Applied Superconductivity Laboratory ASCLab | Li J.,Applied Superconductivity Laboratory ASCLab | And 3 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2010

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 2Cu3O7-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 attenuated in accordance to the varying of the applied field dependent on the PMG's rotating speed: attenuating when speeding up and rising slightly when speeding down. This observed phenomenon is of great importance in design and application of the HTS maglev system. © 2006 IEEE. Source

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