Optimal Output Feedback Controller Design of Permanent Magnet Synchronous Motor Speed Servo System

In response to the problems of unknown model parameters of permanent magnet synchronous motor (PMSM) and inability to directly measure armature current and load torque, this paper designs an output feedback control scheme based on adaptive dynamic programming (ADP) to achieve optimal speed tracking control for PMSM. Firstly, based on the internal characteristics of the PMSM, the mathematical model＇s structure is determined. An auxiliary system corresponding to the original system is constructed, and a new linear quadratic index is introduced to achieve optimal speed tracking adjustment. Next, an embedded observer is designed that can reconstruct all system states with measurable data in the presence of unknown system models. In addition, this paper proposes an off-policy ADP method to approximate the solution of the optimal control gain. Finally, the simulation results verify that the proposed control scheme achieves precise speed tracking performance and good transient response in the presence of unknown model parameters and unmeasurable armature current and load torque, while reducing voltage shocks. © 2024 Science Press. All rights reserved.