Analog and Digital Speed Control of DC-Drive by Using Different Control Schemes


A comparative study for the speed control of a dc-drive, in both analog and digital systems, using proportional and integral (PI), integral-proportional (I-P), and proportional-integral (P-I) control schemes is presented here. The current and the speed responses to a step changes in the speed references and the load torque by using the different control schemes are compared to evaluate the merits of each control scheme.The sensitivity to the controller gains is discussed in briefly in this paper. The simulation results are presented for each control scheme based on Matlab-7 release-14, where the (I-P) control scheme offers some distinctive advantages over other control schemes. The P-I control scheme offers undesirable speed response where the steady-state error is very large in this control scheme.