Simultaneous identification and torque regulation of permanent magnet synchronous machines via adaptive excitation decoupling

Parameter identification and output regulation are generally conflicting objectives. However, in the case of overactuated systems, there is an opportunity to achieve these objectives simultaneously. This paper presents a simultaneous identification and adaptive control design methodology for overactuated systems which is applied to the torque regulation problem for permanent magnet synchronous machines. Excitation and control inputs to the system are first designated. The excitation input is then treated as a disturbance which is decoupled from the regulated output via an excitation decoupling control law. Machine parameters are estimated with a normalized gradient-based algorithm, and necessary conditions for parameter convergence are established. Simulation results confirm the necessary conditions for parameter convergence, as well as the effectiveness of the resulting closed-loop torque regulator.