Non-Singular Terminal Sliding Mode Control with Coupling Compensation for High-Speed Maglev Suspension System

The interference of the high-speed maglev train is significant at higher operation speeds, bringing challenges to sus-pension control. In this paper, the diverse sources of interference on the electromagnet of the high-speed maglev train are analyzed, and a finite time disturbance observer is constructed for matched and unmatched disturbances. Combined with the observer, a non-singular terminal sliding mode control algorithm is designed to overcome the disturbances. Furthermore, considering the multi-point coupling effect of the suspension electromagnet, a cross-coupling control compensation algorithm was designed to compensate the controller. Compared with traditional terminal sliding mode controllers, the composite method proposed can reduce the fluctuation amplitude of the suspension gap under disturbance conditions by more than 60%, providing a new idea for further improving the suspension reliability and stability of maglev trains under high-speed operating conditions.