Speed Control of a PMSM drive system using a nonsingular terminal sliding mode controller

Due to its dependability, high accuracy, and performance, the permanent magnet synchronous motor (PMSM) is becoming an attractive option for electric vehicle traction systems. In this context, the objective is to achieve high power conversion efficiency and high mechanical speeds with great precision. Therefore, motor control is of paramount importance in EVs as a vehicle on the road is prone to various disturbances and load variations. Hence, a robust speed controller is necessary to ensure high operational performance, precise speed tracking, minimal overshoot, and disturbance rejection. In this study, a nonsingular terminal sliding mode controller (NTSMC) is proposed for the speed control of a PMSM powered by a three-phase voltage source inverter (VSI). NTSMC is a well-established method that provides high-performance control and can effectively handle parameter uncertainties and disturbances, making it highly suitable for PMSM speed control. The stability of the NTSMC is validated using Lyapunov stability theory. Finally, several simulations are performed. The proposed method demonstrates through simulations that it surpasses the conventional proportional-integral (PI) controller. Additionally, it provides precise speed tracking, high-performance control, and reduced overshoot, proving its feasibility and effectiveness.