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The Scientific World Journal
Volume 2015, Article ID 132843, 15 pages
Research Article

Sensorless Load Torque Estimation and Passivity Based Control of Buck Converter Fed DC Motor

DEEE, Anna University, Chennai 600 025, India

Received 15 December 2014; Revised 11 February 2015; Accepted 19 February 2015

Academic Editor: Stanislaw Migorski

Copyright © 2015 S. Ganesh Kumar and S. Hosimin Thilagar. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Passivity based control of DC motor in sensorless configuration is proposed in this paper. Exact tracking error dynamics passive output feedback control is used for stabilizing the speed of Buck converter fed DC motor under various load torques such as constant type, fan type, propeller type, and unknown load torques. Under load conditions, sensorless online algebraic approach is proposed, and it is compared with sensorless reduced order observer approach. The former produces better response in estimating the load torque. Sensitivity analysis is also performed to select the appropriate control variables. Simulation and experimental results fully confirm the superiority of the proposed approach suggested in this paper.