Comparison of P-I and I-P controller by using Ziegler-Nichols tuning method for speed control of DC motor

In this paper we use Ziegler-Nichols tuning method for tuning of a Proportional-Integral (P-I) and Integral-Proportional (I-P) controller for a DC motor to control its speed. P-I controller is the most common controller used for speed control of D.C motor. However P-I controller has some disadvantages like high overshoots and sensitivity to controller gains. Therefore to overcome these disadvantages, I-P controller has been implemented for speed control of DC motor. The overshoots in I-P are 30.4% less of P-I controller overshoots. In this work both P-I and I-P controllers are implemented in MATLAB (Simulink) and compare the performance of these two controllers on the basis of their transient response.