DocumentCode :
3011843
Title :
Improvement of dynamic characteristic for sensorless vector-controlled induction motor system with adaptive PI mechanism
Author :
Chen, Shuo ; Kai, Toshihiro ; Tsuji, Mineo ; Hamasaki, Shin-ichi ; Yamada, Eiji
Author_Institution :
Dept. of Electr. & Electron. Eng., Nagasaki Univ.
Volume :
3
fYear :
2005
fDate :
29-29 Sept. 2005
Firstpage :
1877
Abstract :
This paper introduces a speed sensorless vector-controlled system for general-purpose induction motor, which is based on the flux observer and the model reference adaptive system method. According to the vector control theory of an induction motor, this system utilizes the q-axis flux converging on zero for speed estimation and speed control. In order to solve the problems of flux estimation by using only a voltage model, the flux-observer-based method is applied. As the mathematical model of this system is based on a synchronously flux-rotating reference frame, a linear model of the proposed system is easily derived to analyze the dynamic characteristic under the influence of the controller gain. For improving the system dynamic characteristic, an adaptive PI controller for speed estimation with variable gain is employed to change the proportional and integral gains on-line according to the q-axis flux. We present the choosing rule for Pl gains of speed estimation. Furthermore, a simplified linear function of this controller is proposed and the rule is modified considering the system being under the influence of noise. The new controller is compared with the conventional controller (constant gain) by experimental result. The validity of the proposed method is proven through experimentation
Keywords :
PI control; angular velocity control; control system synthesis; induction motors; machine vector control; magnetic flux; mathematical analysis; model reference adaptive control systems; observers; adaptive PI controller; adaptive PI mechanism; flux observer; model reference adaptive system method; sensorless vector-controlled induction motor system; speed control; speed estimation; speed sensorless vector-controlled system; synchronously flux-rotating reference frame; Adaptive control; Adaptive systems; Control systems; Induction motors; Machine vector control; Mathematical model; Pi control; Programmable control; Velocity control; Voltage;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical Machines and Systems, 2005. ICEMS 2005. Proceedings of the Eighth International Conference on
Conference_Location :
Nanjing
Print_ISBN :
7-5062-7407-8
Type :
conf
DOI :
10.1109/ICEMS.2005.202888
Filename :
1575085
Link To Document :
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