A speed control system of an armature-controlled DC motor uses the back emf voltage of the motor as a feedback signal.
(a) Draw the block diagram of this system.
(b) Calculate the steady-state error of this system to a step input command setting the speed to a new level. Assume that Ra = La = J = b = 1, the motor constant is Km = 1, and Kb = 1.
(c) Select a feedback gain for the back emf signal to yield a step response with an overshoot of 15%.