| Benefit of the passive and self-stable levitation performance, the high temperature superconducting (HTS) Maglev is an ideal candidate for the future ground rail transportation.In practical application, the turnout plays an important role in the switch of train, while a mass number of the switch devices are required to realize the turnout and the vehicle allocation, especially near the railway station. Due to the strong magnetic force between adjacent permanent magnet guideway (PMG) section, the traditional mechanical switch device is too difficult to implement. Therefore, the HTS Maglev needs a turnout device without the relative motion of the guideway, while the electromagnetic turnout is an ideal selection. In addition, the control system of the rail transportation is an important security for the safety operation of the train, and it is an important part for the application of HTS Maglev system in the future. Since the successful development of the first man-loading HTS Maglev vehicle in 2000, numerous studies on the HTS Maglev vehicle have been carried out both in China and abroad. Present researches mainly focus on the electromagnetic characteristics between the PMG and the HTS bulks, but lack of research about the turnout device and the control system of the HTS Maglev. Based on above background, the turnout devices, the basic control system of the turnout devices and the operational control of the HTS Maglev vehicle were studied in this thesis.In order to provide a platform for the design of the control system, an"8" shaped turnout model of the HTS Maglev system was constructed, including the PMG, micro-Maglev vehicle, electromagnetic magnet and linear motor drive, in addition, the platform also provides the hardware foundation for the follow-up study of the stability of the electromagnetic turnout. Firstly, the principle of the electromagnetic turnout with Halbach array is analyzed, and the design objective of the electromagnet was proposed as well. The simulation model of the electromagnetic turnout was built through the ANSOFT software.Considering the costing, magnetic permeability, saturation magnetic induction and other related key parameters, the structure and dimensions of the electromagnet was determined after repeated optimization. In order to verify the simulation results, a turnout device model with "Y" shaped have been constructed to prove the feasibility of the electromagnetic turnout through experimental verification. The results show that the optimized electromagnetic turnout can successfully realize the function of a stable turnout, which proves the feasibility of the designed electromagnetic turnout. Consequently, according to the application demand, an overall design of the system was completed, which was divided it into two parts: the ground control system and the vehicle micro-system. In the hardware aspect, the master control chip of the ground part is STC89C52, and the line code circuit,sensor signal-input circuit, electromagnet control circuit, linear motor control circuit, parking control circuit and voltage-stabilized circuit were designed, while the control chip of the vehicle part uses AT89C2051 to complete the auxiliary work. As for aspect of the software,the assembly language and C language were used to complete the program design, together with the hardware part, to realize the control function of the Maglev vehicle.Finally, the experimental result show that, the “8” shaped HTS Maglev system model could realize the drive, the rail switch and the designated parking, which prove the feasibility of the electromagnetic turnout for the HTS Maglev system. These results will provide a theoretical basis for the engineering application of HTS Maglev. |
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