Investigation of frequency controlled sensorless induction motor drives

Jonas Kriaučiūnas

Doctoral dissertation

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This dissertation investigates sensorless variable speed drives dynamic models and their simulation results.

The thesis layout consists of introduction, three main chapters, conclusions, bibliography and list of publications.

The introduction reveals the investigation problem, importance of the work and the object of research as well as describes the purpose and tasks of the paper, research methodology, scientific novelty, the practical significance of obtained results and defended statements. The author’s publications on the subject of the defended dissertation, offering the material of made presentations in conferences and the structure of the dissertation are presented at the end of introduction.

The first chapter analyses the references on mathematical models of variable frequency drives. Reference frames of induction motors and their transformation are analyzed. Review of motor control methods, sensorless electric drives development and relevance, fuzzy logic control method are presented. Problems of real time controlled electromechanical systems are summarized. At the end of the chapter, conclusions and tasks for the dissertation are formulated.

The second chapter is dedicated for methodology and tools to develop models of sensorless frequency controlled induction motor drives. The mathematical and computer models of speed observer are developed. Tools for synthesis of fuzzy logic controller and control of electromechanical system in real time are presented.

In the third chapter created computer models and results of experimental investigation are presented. The induction motor drive system with nonlinear fuzzy and proportional integral derivative (PID) controller, which regulates motor speed in all operating speed range, is created and analyzed. All simulations are done at variable speed and load setting. Results and models accuracy are verified using in real time controlled experimental stand.

The results of the work were presented in ten scientific articles: three –published in journals quoted in Thomson Reuters Web of Science databases, one – in periodic Lithuanian journals, six – in referred international conference materials. Nine reports were presented on the subject in conferences at national and international levels.

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145×205 mm
112 p.
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