Speed Control of Buck-converter Driven Dc Motor Using LQR and PI: A Comparative Assessment

This paper presents the detailed account on the control design of a buck converter driven DC motor. Linear quadratic regulator (LQR) and Proportional-Integral (PI) are the techniques proposed in this investigation to control the speed of a DC motor. The dynamic system composed from converter/motor is considered in this investigation and derived in the state-space and transfer function forms. Complete design and analyses of simulation results for LQR and PI technique are presented in frequency domain and time domain. Performances of the controller are examined in terms of angular velocity, duty cycle input energy and armature current. Finally, a comparative assessment of the impact of each controller on the system performance is presented and discussed.