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Nonlinear Observer Based Sensorless Direct Torque Control of Induction Motor

Pai, Dinesh A and Mangsuli, Purnaprajna R and Rao, NJ (2000) Nonlinear Observer Based Sensorless Direct Torque Control of Induction Motor. In: The Third International Power Electronics and Motion Control Conference, 2000. PIEMC 2000, 15-18 August, Beijing,China, Vol.1, 440-445.


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Induction motor speed control is an area of research that has been in prominence for some time now. Recent advances in this field have made it possible to replace the DC motor by induction machines, even in applications that demand a fast dynamic response. Many industrial applications demand speed sensorless operations, due to various reasons. It is also required to strictly maintain the speed of the motor within certain permissible tolerance, irrespective of the load changes that occur in the system. Unless prior knowledge of the load characteristics is known, it is very difficult to compensate for the same. Direct torque control (DTC) of an induction motor is a popular method because of the resulting fast dynamic response of the motor, lower sensitivity to motor parameter variations and relatively low switching harmonics in the inverter. However, the present DTC approach is unsuitable for high performance applications because of the need of a speed sensor for increased accuracy, the absence of any error decay mechanism, and the requirement of prior knowledge of the load or disturbance characteristics. In this paper, a nonlinear observer is designed for the stator flux, speed and load torque estimation that will take care of the above limitations. The estimated values along with other measured states are used for the closed loop speed sensorless control operation of the induction motor. Simulations are done and the results discussed.

Item Type: Conference Paper
Publisher: IEEE
Additional Information: Copyright 1990 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords: Motor control;Nonlinear observer;State convergence
Department/Centre: Division of Electrical Sciences > Electronic Systems Engineering (Formerly Centre for Electronic Design & Technology)
Date Deposited: 16 Feb 2006
Last Modified: 19 Sep 2010 04:23
URI: http://eprints.iisc.ac.in/id/eprint/5406

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