Finite-time control for permanent magnet synchronous motor position tracking system

This paper investigates the problem of position tracking of Permanent Magnet Synchronous Motor (PMSM). On the basis of analyzing the mathematical model of the PMSM, the exact linearization and decoupling of the motor model can be achieved by using the feedback-linearization technique. First, the PMSM position tracking system is transformed to two linear control subsystems by using the feedback linearization. The corresponding finite-time controllers are designed respectively for the two subsystems. Then, the analysis of stability is given for the PMSM closed-loop system. Compared with the corresponding control method of asymptotical stability, the scheme based on the finite-time control can track the desired position signal in finite-time and obtain a better dynamic response and anti-disturbance performance. The simulation results illustrate the effectiveness of the control scheme.