Control method research on combined-levitation-and-propulsion system used in maglev vehicles

With a new combined-levitation-and-propulsion system used in mid-low speed maglev trains as the research object, this paper uses an analytical method to establish its levitation and propulsion electromagnetic force model. On this basis, the method of constant slip frequency control and synchronous speed frequency control of the system are analyzed respectively. A nonlinear PID controller is designed and the simulation for the levitation control of the system is carried out and researched. The results show that the method of the combination of constant slip frequency control and synchronous speed frequency control applied independently to control propulsion and levitation force is convenient and feasible. The system can achieve stable levitation without affecting the propulsion control, so as to ensure the normal operation of the system.