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The Chaotic Detection Mechanism and Method of Vector Controlled Induction Motor at Very Low Speed

Author: GuoXiaoLu
Tutor: ZhangBo
School: South China University of Technology
Course: Power Electronics and Power Drives
Keywords: Vector control Asynchronous motor Weak signal Chaos Detection System Duffing oscillator Speed ??projection device
CLC: TM343
Type: Master's thesis
Year: 2010
Downloads: 89
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Abstract


At present, the induction motor speed sensorless vector control technology is the use of easy to detect stator current and voltage obtained indirectly rotor speed , under normal circumstances obtain satisfactory control performance. However, at very low speed, the stator current , the voltage is relatively small , measured voltage and current signals with larger error , resulting in poor control performance , easy to achieve. In this paper, chaotic sensitivity to initial conditions and noise immunity , proposed using chaotic detection system to replace the Hall sensor to accurately detect the stator current and voltage signals , in order to achieve the speed sensor technology at very low speed applications a new idea . First, based on chaos theory in the inverted sawtooth mapping model to describe the method of symbolic dynamics for the design of a weak electrical signals based on chaotic state detection method. According to the different types of power , constant-current detection circuit can be divided into weak electrical signals in hybrid dynamic detection circuit and constant pressure dynamic mixing two kinds of weak signal detection circuit . Establish a numerical simulation model verify its validity . Then, the analysis of the chaotic state - periodic state electrical signal detection methods. Duffing equation using the well-known as a model , we propose a sinusoidal signal frequency micro-change detection methods , discusses the initial phase of weak signal detection method , we propose a simple dichotomy indent effective phase detection method proposed two extraction weak signal amplitude approach. Secondly, the analysis of the induction motor vector control theory and mathematical models , as well as speed projection model . Using the Matlab / Simulink software construction of the vector controlled induction motor simulation models and very low running speeds chaos detection simulation model designed chaotic detection system and the speed of projection devices , accurately detect very low rotational speed of the rotor . Finally this paper summarizes the research work undertaken and prospects for future research work .

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CLC: > Industrial Technology > Electrotechnical > Motor > AC motor > Induction motor
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