Levitation control of permanent magnet electromagnetic hybrid suspension maglev train

To improve the riding performance and levitation stability of a high-speed permanent magnet electromagnetic suspension system maglev train, a control strategy based on an integral joint structure model is proposed. First, the system model of joint structure instead of a single maglev unit is established, then a state observer is designed to observe the movement of a suspension frame, and a control strategy based on linear quadratic optimal control method is proposed. This control strategy based on a joint structure model is advantageous in suspension performance in the presence of external disturbances. Comparative simulation results show that this control strategy has a better performance under the condition of external force disturbance. An experiment on single-carriage high-speed permanent magnet electromagnetic suspension system maglev train is conducted on a 1.5-km test line; the performance is satisfactory for employment.