Cost effective control of a partially flat boost converter fed DC motor

In this paper, the load torque is measured using sensorless online algebraic approach (SAA) and sensorless reduced order observer (SROO) scheme without torque as well as speed sensor. The measured torque is used in controlling the speed of DC motor connected through a partially flat boost converter using the exact tracking error dynamics passive output feedback (ETEDPOF) control law. Further, SAA is compared with SROO scheme for frictional, propeller, fan type, and unknown load torques. The results obtained confirm the reduction in cost of due to the indirect measurement of load torque and speed.