Robust adaptive backstepping sliding mode controller for a DC-DC buck converter fed DC motor

A nonlinear control scheme is employed in this paper for controlling the speed of DC motors which are driven by DC-DC buck converters. The hybrid robust adaptive backstepping sliding mode control theory is used to design the proposed controller. To handle the sudden load variation effects, the load torque is considered as unknown terms which will estimate using an adaptation law. Exterior turbulences are also considered in the system's dynamical model to illustrate the robustness of the proposed hybrid control scheme. The overall system's stability is established using the Lyapunov theory. At last, simulation results are presented to exhibit the usefulness of the proposed control scheme in the presence of external disturbances and compared with an existing controller. Simulation results reveal that the proposed controller outperforms the existing controller in terms of overshoot and settling time. Contribution-The main contribution of this paper is to design a new composite nonlinear controller for a DC motor control using robust adaptive backstepping and integral sliding mode approaches.