Robustness enhancement of DC drives with a smooth optimal sliding mode control

A quantitative analysis of the robustness of a DC drive control system is attempted. The time-domain expressions of the transient speed deviation and its maximum value due to a step-load application under sliding mode control have been obtained. A new design approach is developed which effectively enhances the robustness of the system against external disturbance. The fast response speed and the robust performance are both achievable without the necessity of compromise. Digital simulations verify the design and results.<>