A5101897966- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Frequency Control in Power Systems
- Magnetic and transport properties of perovskites and related materials
- Magnetic confinement fusion research
- Magnetic Field Sensors Techniques
- Geomagnetism and Paleomagnetism Studies
Sichuan University
2021-2022
The linear-motor type flux pump is a wireless DC power source for high-temperature superconducting coils, which compact in size, efficient energy use, fast output control, etc. It consists of three major parts: windings, phase windings and iron circuit, generates DC-bias AC travelling wave its airgap. In theory, there are controllable parameters such as field, amplitude the wave, field frequency (travelling speed). By changing those parameters, we change applied fields current into coils....
A kilo-amp linear-motor type flux pump with the maximum output DC current exceeding 1610 had been designed and manufactured. We optimized large-current based from previous design, shortened travelling wavelength of pump, simulated its magnetic density distribution COMSOL Multiphysics, obtained present design parameters after analysis. placed 12 superconducting single loops side by in air gaps on both sides used to charge them. applied different gap, was measured at 1619 liquid nitrogen 77 K....
This paper presents the preliminary charging test results of an high temperature superconducting (HTS) no-insulated (NI) double racetrack coil with linear-motor type flux pump. The is designed and manufactured for rotor field winding a 16.9-kW-class HTS synchronous motor. motor was to employ contactless static excitation device (CSED), i.e., pump, which can charge installed in rotating machine manner. In experiment, major components motor, such as CSED, had been manufactured, tested...
In order to further optimize the size of linear-motor type flux pump, an updated motor pump device with single side DC winding was designed and fabricated. Compared previous generation traveling wave length 21 mm, volume this 15 mm is reduced by nearly 30% pumping current capacity increased more than 30%, which generated same biased AC travelling magnetic in airgap, pumped into high temperature superconducting (HTS) closed-loop a non-contacting manner, based on macroscopic coupling effect....
This paper proposed and demonstrated a feedback control method for high temperature superconducting (HTS) dynamo, which was based on an additional DC coil. the theory of macroscopic magnetic coupling effects (MMCE) discovered by Wang Coombs, "Macroscopic effect: The physical origination high-temperature flux pump," <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Phys. Rev. Appl.,</i> using this theory, we had realized very flexible accurate...
In this paper, we present the fabrication and performance of a linear-motor type flux pump with pumped current larger than 640 A. This high-temperature superconducting (HTS) can be used for magnetic resonance imaging (MRI) magnets HTS electric machines. We use to charge 10 closed-loops, show tested results pumping under different applied frequencies field amplitudes. device output direct A at 77 K. The equals DC power source low voltage high current. Comparing traditional supply same rated...
This paper investigated the method of using multiple linear-motor flux pumps to increase central magnetic field an HTS magnet composed six stacking insulated YBCO double pancake coils. In this work, we compared two different excitation methods based on pumps, i.e., in series and segmented excitations, investigate their exciting performances magnet. Experiments showed that excitation, maximum operation current was limited by coil smallest critical current. On other hand, both each were...