Energy Conversion

Electric machines are a technology of choice in many modern energy conversion applications, including propulsion for hybrid-electric vehicles, wind energy generation, and flywheel energy storage systems. Interest in machines is steadily increasing due in large part to the flexibility of controls offered by modern computers and power electronic devices. In this course, the tools required for analysis and design of electromechanical energy conversion are developed. Upon completion of the course, a student?s engineering toolbox should contain 1) an understanding of the basic principles of static and electromechanical energy conversion, 2) methods to control static power converters, 3) knowledge of the use of reference frame theory applied to the analysis of rotating devices, 4) an understanding of the steady-state and dynamic characteristics of induction, permanent magnet synchronous, and wound-rotor synchronous machines, and 5) state variable analysis of electromechanical devices and converter supplied electromechanical drive systems.


Credit Hours:


Learning Objective:

A student who successfully fulfills the course requirements will have demonstrated an ability to:
  • Recognize the basic principles of electromechanical energy conversion
  • Use reference frame theory to manipulate dynamic equations of electric machinery
  • Calculate the dynamic performance of electric machinery in the time domain
  • Identify similarities and differences in the operating characteristics of induction, permanent-magnet synchronous, and wound-rotor synchronous machines
  • Use dc-ac power conversion circuits to control electric machinery


Basic principles of static and electromechanical energy conversion. Control of static power converters. Reference frame theory applied to the analysis of rotating devices. Analysis and dynamic characteristics of induction and synchronous machines. State variable analysis of electromechanical devices and converter supplied electromechanical drive systems

Topics Covered:

Week Major Topics
1 Stationary 3-phase AC circuit
2 Definitions and mathematical preliminaries
3 Balanced steady-state conditions
4 Magnetic circuits
5 Energy/force
6 Basic concepts of distributed windings
7 Winding functions and MMF
8 Circuit parameters
9 Modeling
10 Steady-state operation
11 Transient studies
12 Modulation schemes


Basic concepts and operational behavior of DC, induction, brushless DC, and stepper motors.

Applied / Theory:

70 / 30


Weekly assignments will be given posted online and due the following week.


Two one-hour exams and one final exam.



  1. Analysis of Electric Machinery and Drive Systems (e-book available through the Purdue Libraries), 3rd Edition, P.C. Krause, O. Wasynczuk, S.D. Sudhoff, and S. Pekarek, John Wiley, 2013, ISBN No. 9781118024294

ProEd Minimum Requirements: