University of Illinois Urbana-Champaign

Designing better induction motor drive systems from efficiency, reliability, and power electronics perspectives

Bazzi, Ali M.

Content Files
Bazzi_Ali.pdf

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https://hdl.handle.net/2142/27678

Description

Title
Designing better induction motor drive systems from efficiency, reliability, and power electronics perspectives
Author(s)
Bazzi, Ali M.
Issue Date
2011-09-23T23:24:17Z
Director of Research (if dissertation) or Advisor (if thesis)
Krein, Philip T.
Doctoral Committee Chair(s)
Krein, Philip T.
Committee Member(s)
  • Chapman, Patrick L.
  • Domínguez-García, Alejandro D.
  • Liberzon, Daniel M.
  • Sauer, Peter W.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Date of Ingest
2011-09-23T23:24:17Z
Keyword(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.
Graduation Semester
2010-12
Permalink
http://hdl.handle.net/2142/27678
Copyright and License Information
Copyright 2010 Ali M. Bazzi

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