Title :
A new approach to the levitation control of an electromagnetic suspension vehicle
Author :
Bittar, Anselmo ; Da Cruz, José Jaime ; Sales, Roberto Moura
Author_Institution :
Dept. of Electron. Eng., Sao Paulo Univ., Brazil
Abstract :
A new approach to the levitation control of an electromagnetic suspension vehicle prototype is proposed. The prototype has four electromagnetic actuators of attractive type and four inductive gap sensors, all located at the corners of the prototype. The vehicle levitation is performed through the control of heave, roll and pitch. A three degree of freedom rigid body model is developed. A situation where the number of actuators is larger than the number of control variables is thus characterized. A command policy of actuators generates an optimal distribution of forces by the actuators in order to produce the force and moments required by the heave, roll and pitch controllers. A measurement processing is done on the signals of the gap sensors to generate estimates of heave, roll and pitch. To stabilize the closed-loop system, a controller with a lead-lag phase characteristic is implemented. The obtained experimental results show that the closed-loop system presents a good performance
Keywords :
closed loop systems; electric sensing devices; electromagnetic actuators; force control; magnetic levitation; position control; railways; actuators; closed-loop system; electromagnetic suspension vehicle; force control; heave control; inductive gap sensors; lead-lag phase; magnetic levitation; pitch control; rigid body model; roll control; Actuators; Electric variables control; Electromagnetic induction; Force control; Force sensors; Levitation; Optimal control; Prototypes; Sensor phenomena and characterization; Vehicles;
Conference_Titel :
Control Applications, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Trieste
Print_ISBN :
0-7803-4104-X
DOI :
10.1109/CCA.1998.728417