Sliding mode speed control of Brushless DC Motor using Pulse-Width-Modulated current regulator

This paper proposes a sliding mode controller (SMC) design for a Brushless DC Motor (BLDCM) to achieve high-performance speed control. Based on Pulse-Width-Modulation (PWM) technique, a PWM-based controller in the inner current loop is first developed to perform a fast current control. A sliding mode speed controller is then designed in its outer control loop to enhance the speed control. Finally, the effectiveness of the proposed control scheme under the load disturbances and parameter uncertainties is verified by simulation results and comparison with proportional-integral control (PIC) approach.