Equipment And Experiment Research Of High Temperature Superconducting Electric Magnetic Levitation System

Currently, there are two types of maglev principle for the maglev vehicles:Electromagnetic and Electrodynamic. For the type of Electromagnetic, vehicle can be suspended in static position, but it needs a complex control system. The control system of the type of Electrodynamic is simpler, but, generally, the vehicle can be suspended only when it moves. In recent years, in order to combine the advantages of the types of Electromagnetic and Electrodynamic, maglevs of the permanent magnet wheel type and high frequency coil type appeared. However, the former needs high speed mechanical rotation which would bring the machinery loss and the gyro effect. The latter, on the other hand, needs a high frequency current which has high loss and cannot adopt superconductive coils when current is high. Therefore, the team which the author takes in proposes a new structure and principle of the Electrodynamic maglev system. It uses the repulsion between the rotating magnetic field of axial flux on board and a non-ferromagnetic secondary on the ground. To achieve the same levitation force, it needs less current frequency than the type of High-frequency coil. So in order to increase the excitation current and reduce power loss, we choose the high-temperature superconducting materials for induction levitation motor windings.This thesis is just based on above to propose the HTS electric rotating magnetic levitation system and gives the experimental equipment design and experimental study. Considering the high price of the HTS materials, it’s necessary to study an induction levitation motor with copper windings of the same principle.First, this thesis introduces the characteristics and the development of maglev technology. On this basis, the significance of this thesis topic is proposed. Then based on the electromagnetic field theory, this thesis gives a3D modeling and simulation for the induction levitation motor with copper windings in Ansoft software, especially study the levitation force characteristics, and then deduces the equivalent circuit of induction levitation motor with copper windings. Combined with the simulation results, this thesis gives an appropriate experimental method. And next based on the introduction of domestic and foreign HTS maglev typical experimental equipment, this thesis designs and develops a multifunctional experimental equipment of single motor which is applicable to the subject, and proposes a design scheme of the overall experimental equipment. Finally, using the multifunctional experimental equipment and the appropriate experimental methods, this thesis makes an experiment on the induction levitation motor with copper windings and studies the levitation force’s changes when the current or air gap changes. Then compared with the simulation results, it shows that experimental results and simulation results are very similar. This shows the validity of the design. It has certain guiding significance for the optimization of the motor and the subsequent study on the HTS levitation motor.