OPTIMAL STATE FEEDBACK CONTROLLER FOR SEPARATELY-EXCITED DC MOTOR

In this paper, a state feedback controller for separately-excited DC motor (SEDM) is presented. The controller is designed using the Optimal Control approach. The motor, with and without the controller, is modeled as a multi-input multi-output (MIMO) system with state-space and transfer function representations. The control inputs are the motor armature and the motor field voltages. The controlled outputs are the motor angular speed and the motor field current. The system states are the same as the system outputs. The performance of the system with the designed controller is simulated using MATLAB (R) /SIMULINK (R) , and is compared with that of the open loop system. The results show excellent performance of the controlled system, in terms of steady-state error, output decoupling, response speed and general system behavior.