Abstract
This article presents a robust speed controller for field-oriented controlled permanent magnet synchronous motor drives. The proposed controller is designed using integral variable structure control combined with a linear quadratic regulator. The linear quadratic regulator scheme is used to decide the optimal feedback gain to shape the system dynamics by tuning the integral variable structure control switching plane to guarantee the robustness of the control algorithm in both reaching and sliding phases. The complete drive is implemented in real time using a digital signal processor control board (DS1102, Texas Instruments, dSPACE GmbH, Germany). The tracking properties and robustness of the proposed scheme are examined through both simulations and experimental work. It guarantees accurate control performance in the presence of parameter variation, step speed change, and load disturbances. The performance of the permanent magnet synchronous motor drive system with a conventional proportional-integral controller is presented in comparison with the proposed controller. The results show a significant improvement in both the transient and steady-state responses over the conventional proportional-integral controller.