The Study Of Hybrid Excitation Rail Eddy Current Braking System Of High-speed Train

A hybrid excitation rail eddy current brake (ECB) system of high-speed train is proposed in this paper. Compared to existed eddy current brake system, hybrid excitation rail ECB system has advantages, that is, controllable, energy saving and various-operating-modes. As one of the key technologies of high-speed train, brake system of train is of great importance. The current braking modes have lots of limits, which restrict the increasing of train speed. Hybrid excitation ECB system is considered as the most hopeful braking system of next generation, and worth studying. Aiming at solving the two technical defects of current ECB, the research is helpful to update the performance of ECB. And hybrid excitation ECB system is very promising in high-speed railway, urban railway and high-speed maglev. What is done in this thesis are below:First of all, a hybrid excitation rail ECB system is proposed, which is based on the comparison of current ECB and its excitation pattern. Then the principles and working process of braking system are demonstrated. And analysis and design of ECB are done.Furthermore, with electromagnetic system analyzed using FEM by ANSYS, the air gap, exciting current, which have influences on braking force and attractive force, are discussed. The advantages of hybrid excitation ECB are indicated compared to braking system with single magnetic source exciting. And On the basis of that, the following structure optimization of the electromagnetic system is possible.Finally, the structure optimization of the electromagnetic system is done and the results of simulation indicate that the performance of system is improved.