Torque Control of an Electromagnetic Eddy Current Brake

Abstract:

The torque control method of an electromagnetic eddy current brake was studied. First, the calculation formula of braking torque was obtained by using the magnetic circuit analysis method, and the mathematical relationship between braking torque and excitation current and train speed was obtained. Thus the overall scheme and operation principle of the control system were demonstrated, the main modules of the system were introduced, and the simulation model was established. Secondly, the design process and three control algorithms, which include the PID control, the fuzzy control, and the fuzzy self-adaptive PI control, were introduced. Lastly, the simulation was conducted and a comparison analysis was made between the results. The result shows that the three closed-loop control algorithms have effectively controlled the brake torque in the braking process. Moreover, fuzzy self-adaptive PI control presents the best results in both steady-state performance and transient performance, trailed by fuzzy control and PID control successively.