DocumentCode :
2512749
Title :
Adaptive control of the three-phase squirrel cage induction motor with load torque estimator
Author :
Gaiceanu, Marian ; Rosu, Emil ; Dache, Cristi ; Paduraru, Romeo ; Munteanu, Traian
fYear :
2012
fDate :
24-26 May 2012
Firstpage :
460
Lastpage :
465
Abstract :
The performances of the adjustable electric drive systems are directly related to the accurate knowledge of the parameters. It is well known that the resistances are temperature dependent and the inductances are function on the magnetising B-H curve of the ferromagnetic material and the saturation effect. In order to obtain a high performance electric drive system, an adaptive structure in direct form (the controller parameters are obtained on-line) is proposed in this paper. The adaptive mechanism of the parameters is obtained by adding two terms: the first one will support a gradient adjustment law (assuring the asymptotic performances) and the second one will comport an adjustment that includes a sigmoid function specific for variable structure control. The last component improves the transient and steady state response by eliminating the small oscillations of the closed loop response around the equilibrium state in order to obtain a zero tracking error. The adaptive mechanism assures the robustness to the external disturbances and to the unmodeled dynamics. Another issue presented in this paper is an original load torque method. The load torque estimator is based on the transversal current stator component and the measured rotor speed. This method presents certain advantages instead of using measured method, which requires a low pass filter: no additional hardware, and faster control response. Matlab/Simulink based simulation results will show the validity of the proposed solution.
Keywords :
adaptive control; ferromagnetic materials; induction motor drives; low-pass filters; machine control; power filters; squirrel cage motors; transient response; variable structure systems; B-H curve magnetization; Matlab-Simulink based simulation; adaptive control mechanism; adaptive structure; adjustable electric drive systems; closed loop response; equilibrium state; ferromagnetic material; gradient adjustment law; high performance electric drive system; load torque estimator method; low pass filter; rotor speed; saturation effect; sigmoid function; small oscillation elimination; steady state response; temperature dependent; three-phase squirrel cage induction motor; transient response; transversal current stator component; variable structure control; zero tracking error; Adaptive control; Induction motors; Mathematical model; Rotors; Torque; Vectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Optimization of Electrical and Electronic Equipment (OPTIM), 2012 13th International Conference on
Conference_Location :
Brasov
ISSN :
1842-0133
Print_ISBN :
978-1-4673-1650-7
Electronic_ISBN :
1842-0133
Type :
conf
DOI :
10.1109/OPTIM.2012.6231903
Filename :
6231903
Link To Document :
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