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TORQUE AND FLUX TRACKING OF INDUCTION MOTORS
Author(s) -
EspinosaPérez Gerardo,
Ortega Romeo,
Nicklasson Per Johan
Publication year - 1997
Publication title -
international journal of robust and nonlinear control
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.361
H-Index - 106
eISSN - 1099-1239
pISSN - 1049-8923
DOI - 10.1002/(sici)1099-1239(199701)7:1<1::aid-rnc194>3.0.co;2-2
Subject(s) - control theory (sociology) , torque , nonlinear system , induction motor , vector control , controller (irrigation) , norm (philosophy) , control engineering , observer (physics) , switched reluctance motor , rotor (electric) , backstepping , computer science , direct torque control , tracking (education) , engineering , control (management) , physics , law , adaptive control , artificial intelligence , biology , quantum mechanics , political science , agronomy , mechanical engineering , pedagogy , psychology , voltage , thermodynamics , electrical engineering
The problem of torque tracking and rotor flux norm regulation of induction motors perturbed by an unknown constant load torque was recently solved with an observer‐based controller in Reference 5. In this paper we extend this result to treat the practically important case when the rotor flux norm is required to follow a time‐varying reference . The controller design follows the passivity‐based approach and proceeds in two steps: first, we define a target closed‐loop dynamics compatible with the physical model of the motor that delivers the desired rotor flux and torque. Second, we propose a nonlinear dynamic output feedback controller that ensures this behaviour is asymptotically achieved. A proof of global tracking is given under the assumption of known motor parameters. Some key features of our physically based design are that the control law does not require measurement of rotor variables, is always well defined and does not rely on (intrinsically nonrobust) nonlinear dynamics cancellation. A corollary of our main result is the proof that a slight modification of the classical indirect field‐oriented controller ensures global tracking for current‐fed machines. © 1997 by John Wiley & Sons, Ltd.