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Because of the disadvantages of the existing permanent magnetic guideway (PMG) such as low efficiency, a Halbach PMG is proposed to improve the levitation performance of high-temperature superconducting (HTS) magnetic levitation (maglev) vehicle. Magnetic induction of the Halbach PMG is calculated by an analytical method. The screening current density distribution in the superconductor is solved with the flux flow-creep model by the finite-element method, and then the levitation force between the HTS bulk and PMG is calculated by the Lorentz force formula. According to the characteristic of the maglev vehicle, an optimality criterion is proposed to evaluate the levitation performance for the HTS maglev vehicle. [ABSTRACT FROM AUTHOR]

The dynamic measurement of high temperature superconducting (HTS) magnetic levitation (Maglev) vehicle is a very important and difficult problem. In order to investigate the dynamic characteristics behavior of HTS Maglev, an HTS Maglev dynamic measurement system (SCML-03) was successfully developed in Applied Superconductivity Laboratory (ASCLab) of Southwest Jiaotong University, P. R. China. The system is mainly constituted by the circular permanent magnet guideway (PMG), liquid nitrogen vessel, data acquisition and processing, mechanical drive, autocontrol and so on. The PMG is fixed along the circumferential direction of a big circular disk with diameter 1500 mm. The maximum linear velocity of the PMG is about 300 kin/h when the circular disk rotates round the central axis at 1280 rpm. The liquid nitrogen vessel with high temperature superconductors is placed above the PMG, and the vessel is not three-dimensional rigid connection with measurement sensor devices. These sensors can detect weak force change from three-dimensional directions. The maximal vertical and horizontal support force of the system are 3350 N and 500 N, respectively. Test process and results of the HTS Maglev dynamic test system are reported. [ABSTRACT FROM AUTHOR]

In order to design high temperature superconducting (HTS) Maglev launch system, three NdFeB permanent magnetic guideways (PMGs) are investigated and compared for the better levitation forces and guidance forces. The laboratory-scale HTS Maglev launch system was designed and developed successfully in the Applied Superconductivity Laboratory (ASCLab), Southwest Jiaotong University, China. The cooling process of the melt-textured YBaCuO bulk superconductors is made in a big low temperature tube, which is connected with PMG. The method merit is to eliminate fluctuation of liquid nitrogen in the operation test. The longitudinal slopes of the PM guideway are designed with 0–30 degree from the horizontal, and transverse slopes is designed with 15 degree from the horizontal. The HTS Maglev launch system is carried out an experiment in the laboratory. Test results indicate design validity of the HTS Maglev launch system. [ABSTRACT FROM AUTHOR]

An update high temperature superconducting Maglev measurement system (SCML-02) was successfully developed. The system includes liquid nitrogen vessel, cylinder permanent magnet (PM) or PM guideway (PMG), data collection and processing, mechanical drive and autocontrol. The liquid nitrogen vessel with high temperature superconductors (HTSCs) can be placed above or under the PM. This measurement system has other characteristics: high measurement precision, instant measurement at movement of the measured HTSCs specimen, synchronous measurement of levitation and guidance, measurement in three dimensions at one time, relaxation measurement of both levitation and guidance force, and so on. In order to calibrate measurement precision and to verify special function of SCML-02, two cylinder PMs are used, which have the same scale and technical specification. The Maglev properties of HTSCs YBCO bulk are measured on the basis of the calibration results of SCML-02. The levitation forces of single YBCO bulk and of seven YBCO bulks above PMG are measured by SCML-02. All functions are validated experimentally. The main specification of the measurement system is: position precision ± 0.05 mm; vertical force precision 2‰; horizontal force precision 1‰. The force measurement precision has achieved 0.02 N. [ABSTRACT FROM AUTHOR]

The first man-loading high-temperature superconducting (HTS) Maglev test vehicle in the world was successfully developed on Dec. 31, 2000 in Applied Superconductivity Laboratory, Southwest Jiaotong University, China. Heretofore over 24 500 passengers took the vehicle, and it has been operating back and forth about 400 km. The HTS Maglev vehicle provides inherent stability both in the vertical and lateral direction, so no control system is needed. The only control system is used for linear motor driving devices. The melt-textured YBaCuO bulk superconductors are fixed on the bottom of a liquid nitrogen vessel and cooled by liquid nitrogen. The bottom thickness of the rectangle liquid nitrogen vessel with thin wall is only 3 mm. The onboard HTS Maglev module is over the guideway. The guideway consists of two parallel permanent magnetic tracks, whose concentrating magnetic field at 20 mm height above the surface is about 0.5 T. The levitation forces of 8 HTS maglev modules were measured. The total levitation force of 8 onboard Maglev modules was 10431 N at the levitation gap of 10 mm, and 8486 N at the levitation gap of 15 mm, respectively. These results were measured on May 28, 2002. [ABSTRACT FROM AUTHOR]

When the velocity of the normal ground traffic transportation is higher than 350 km/h of the speed limit, not only the running noise of the ground traffic vehicle is higher, but also the 90% driving power is dissipated in the aerodynamic resistance. The high speed may be realized when a high temperature superconducting (HTS) Maglev vehicle runs in low-pressure tube or evacuated tube transport (ETT). Its speed is over 3000 km/h. As a new ground transportation system the HTS Maglev vehicle is presented after the experiment results of HTS Maglev vehicle are discussed in this paper. [ABSTRACT FROM AUTHOR]