Speed and Current Adaptive Control of a Permanent Magnet Synchronous Machine

This paper presents the design of a nonlinear speed and current control of a permanent magnet synchronous machine (PMSM). An adaptive backstepping control design for field oriented control is performed. In the proposed approach, the quadrature and direct currents, as well as the mechanical speed are selected as the state variables, and the control objective is designed to track the reference speed despite parameter uncertainties and torque load perturbation. Since torque load is unknown, and adaptive approach for the control design is proposed. The analysis of stability of the proposed control design is based on Lyapunov Theory, and is shown that the proposed control is stable. Simulation results on a commercial PMSM are presented to verify the performance and feasibility of the proposed control design.