The Study On Tractive Performance Of The Linear Synchronous Motor Used By EMS Maglev Vehicle

Electromagnetic performance, characteristic of propulsion and levitation for long stator Linear Synchronous Motor which used by EMS maglev vehicle were discussed in detail based on the dimensions of motor. Meanwhile, the process of building the propulsive control model was analyzed. Furthermore the variations of stator and mover currents were also analyzed in detail when the stator armature winding had faults.Firstly, the levitating and propulsive electromagnetic fields, the variational rule of electrical parameters, and the variational trend of propulsive and levitating force in one electric period were analyzed in detail by analytical calculation method. Many valuable conclusions were derived during the analysis.Secondly, a model of one electromagnet module based on the dimensions of long stator Linear Synchronous Motor in EMS maglev was established to study the performance of the motor. Based on the ANSYS model, the electromagnetic fields and the characteristic of the force in one electric period was analyzed once again by finite element method (FEM). Comparing with the results of analytical calculation, they were consistent with each other. So the results of electric parameters and force parameters were correct and valid.Thirdly, a lots of ANSYS models were established, and the analytical data from the finite element was processed by an algorithm. The d,q axis inductance, mutual inductance of stator and mover were highlighted along with the long stator motor's currents, air gap length and mover displacement. Then, electromotive force (EMF) of stator winding, mover winding and generator winding were obtained. Furthermore, the experiential formulas of propulsive force and levitation force were derived by Globaloptimization algorithm and conjugate-gradient method.Finally, to verify the validity of the electric parameters and to simulate the motor performance, propulsive control model of Maglev vehicle was constructed in Matlab/simulink circumstance utilizing the above results. The Linear Synchronous Motor used by Maglev vehicle was supplied power energy by three-level inverter. The propulsive system model of maglev vehicle was constructed by rotor-oriented control, coordinates transformation and the space vector control. In the end, a series of simulation results were given. The results were consistent with the technical data, then the validity of the propulsive system model was confirmed. Several sensorless methods were compared by their virtue and disadvantage, then high-frequency voltage signal injection was introduced in this thesis, and the implement process of the algorithm was also explained detailedly. How changed stator current and mover current when stator armature winding faults, were discussed in the condition of different velocity and different carriages.