Lee, H.-T.H.-T.LeeLI-CHEN FUHsu, S.-H.S.-H.Hsu2018-09-102018-09-10200214746670https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945576755&doi=10.3182%2f20020721-6-es-1901.00247&partnerID=40&md5=a90c095fcd80a9371498c5549c1e585chttp://scholars.lib.ntu.edu.tw/handle/123456789/298286This paper proposes an adaptive speed/position tracking control of an induction motor subject to unknown load torque via strictly positive real (SPR) analysis. The controller is developed under a special nonlinear coordinate transform such that either speed or position control objective can be fulfilled. The underlying design concepts are to endow the close-loop system while under lack of knowledge of some key system parameters, such as the rotor resistance, motor inertia and motor damping coefficient. The proposed control scheme comes along with a thorough proof derived based on Lyapunov stability theory. The experimental results are also given to validate the effectiveness of the presented control scheme. Copyright © 2002 IFAC.Adaptive control; Coordinate transformations; Induction motors; Lyapunov stability; Tracking systemsAdaptive control systems; Automation; Induction motors; Mathematical transformations; Position control; Adaptive Control; Co-ordinate transformation; Damping coefficients; Lyapunov stability; Lyapunov stability theory; Nonlinear coordinate transforms; Strictly positive real; Tracking system; Electric machine controlconference paper10.3182/20020721-6-es-1901.002472-s2.0-84945576755