Model predictive control (MPC) based direct torque control (DTC) of permanent magnet synchronous motors (PMSMs)

In this paper, a two-loop control scheme is presented for the direct torque control (DTC) of the permanent magnet synchronous motor (PMSM). The contribution of this paper is twofold. The Drst is to propose an inner-loop model predictive controller (MPC) with the stability analysis. SpeciDcally, the inner-loop MPC is given analytically by minimizing an cost function of the tracking error, and its global asymptotic stability is ensured under the inherent input constraint. In the second, the outer-loop PI controllers are adopted to eliminate the steady state error. The simulation results present that the torque of PMSM shapely tracks the reference in a satisfactory manner while the d-axis current is rapidly regulated to zero.