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Title:Designing better induction motor drive systems from efficiency, reliability, and power electronics perspectives
Author(s):Bazzi, Ali M.
Director of Research:Krein, Philip T.
Doctoral Committee Chair(s):Krein, Philip T.
Doctoral Committee Member(s):Chapman, Patrick L.; Domínguez-García, Alejandro D.; Liberzon, Daniel M.; Sauer, Peter W.
Department / Program:Electrical & Computer Eng
Discipline:Electrical & Computer Engr
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Induction motor drives
drive efficiency
drive reliability
Abstract:This dissertation addresses the design of better induction motor drives from several perspectives. Loss minimization in the machine using real-time optimization methods is studied thoroughly. These methods are categorized and discussed in detail, with special emphasis on the application of ripple correlation control for induction motor loss minimization. The effect of these methods on the overall drive reliability is studied. A complete reliability model considering machine, power electronics, and sensor faults is developed, and a safe-mode controller is chosen to achieve better drive reliability. Loss estimation in power electronics is also addressed in order to achieve system-level loss minimization and design more reliable inverters with better electro-thermal properties. Loss minimization results show that average energy savings exceed 5% in applications such as propulsion and hybrid vehicles. This amount is significant when global energy savings are considered and when the savings are translated to monetary equivalents or reductions in emissions and generation. The effect of loss minimization techniques on the drive reliability is shown to be minimal where the drive maintains over 50 years of expected time to failure. The addition of safe-mode control to mitigate sensor faults enhances closed-loop control reliability and improves it to be closer to a more-reliable open-loop controller while maintaining the desired closed-loop transient response. The loss estimation tool is shown to predict losses in IGBT-diode pairs within an average of 8% error under both periodic and aperiodic switching. These results are essential to design more reliable inverters with appropriate component sizing and better thermal management. The final outcome of this dissertation is a minimum-loss and highly reliable induction motor drive system for current and future applications.
Issue Date:2011-09-23
Rights Information:Copyright 2010 Ali M. Bazzi
Date Available in IDEALS:2011-09-23
Date Deposited:2010-12

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