Mass adaptive controller design for high temperature superconducting levitation system based on feedback linearization

High temperature superconducting (HTS) levitation system is a typical nonlinear system, which is vulnerable to external disturbance and internal unstable. Traditional PID and feedback control can not adapt to large mass changes. For this feature, a mass adaptive controller based on feedback linearization is proposed with reasonable assumptions. The model is obtained by exact feedback linearization. Mass adaptive control estimates the levitation mass by using current and gap signals to compensate for interference. The controller is designed to make the levitation system adaptive to the varied mass, maintain levitation system with stable gap performance. Simulation results show that mass adaptive controller based on feedback linearization is obviously better than the equilibrium point unfolded state feedback controller and mass adaptive method makes PID controller better performed with stronger robustness to varied mass.