Development of Load Torque Estimation and Passivity Based Control for DC Motor Drive Systems with Reduced Sensor Count

In this proposed work, Passivity Based Control (PBC) is selected for performing trajectory tracking
control of DC motor. In PBC, Exact Tracking Error Dynamics Passive Output Feedback (ETEDPOF)
method is preferred for buck converter-fed DC motor drive system. Under load conditions, load torque
estimation is required to implement ETEDPOF. Also, load torque estimation is completed without
using torque and speed sensor which reduces space and cost of the system. In load torque
estimation, sensorless load torque estimation using online algebraic approach for buck converter with
DC Motor as load is designed and developed. Further, the performance of Sensorless online
Algebraic Approach (SAA) is compared with Sensorless Reduced Order Observer (SROO). Results
are presented to validate the features of proposed schemes.