Direct Current (DC) motors have been extensively used in many industrial
applications. Therefore, the control of the speed of a DC motor is an important issue and has
been studied since the early decades in the last century. This paper presents a comparison of time
response specification between conventional Proportional-Integral-Derivatives (PID) controller
and Linear Quadratic Regulator (LQR) for a speed control of a separately excited DC motor.
The goal is to determine which control strategy delivers better performance with respect to DC
motor’s speed. Performance of these controllers has been verified through simulation using
MATLAB/SIMULINK software package. According to the simulation results, liner quadratic
regulator method gives the better performance, such as settling time, steady state error and
overshoot compared to conventional PID controller. This shows the superiority of liner quadratic
regulator method over conventional PID controlle
