Nonlinear Torque Control of BLAC Motor

This study presents the implementation of a hybrid control strategy applied to a brushless AC (BLAC) motor drive. Hybrid control is a general approach for control of a switching-based Hybrid Systems (HS). This class of HS includes a continuous process controlled by a discrete controller with a finite number of states. The overall stability of the system is shown using Lyapunov technique. The Lyapunov functions used contain a term penalizing incremental energy of control error, torque and stator current, enhancing the stability. The closed-loop system with the proposed control low provides good transient response and good regulation the BLAC motor control. A new logical FPGA torque controller based on Lyapunov theory are developed, analyzed and experimentally verified.