• Electric Machines

icon - electric motor

In this course we will cover the fundamental theory associated with electric drive systems, which consist of: an electric machine operating either as a motor, a generator, or both; a power electronic circuit which interfaces the machine to a power supply or an electrical system; and a controller which measures electrical and mechanical quantities and uses this information to control the power electronic circuitry. The capabilities and limitations of different types of electric machines (DC machines, permanent magnet AC machines, induction machines, and reluctance machines) in drive applications will be covered.


Learning Objectives


After completing this course, you should be able to:

  • Explain the basics of magnetic-field devices

  • Describe how electric machines produce torque

  • Discuss the operation of power electronic circuits

  • Design a proportional-integral (PI) feedback control algorithm

  • Summarize the properties of different types of electric machines



  • Introduction and Electric Machinery Fundamentals (33 min)

  • Power Electronic Fundamentals (38 min)

  • Fundamentals of Control (32 min)

  • DC Machines (27 min)

  • DC Machines Drives (29 min)

  • AC Machines l (33 min)

  • AC Machines ll (33 min)

  • Surface Mount Permanent Magnet Machines (35 min)

  • Surface Mount Permanent Magnet Machine Drives (26 min)

  • Reluctance Machines (33 min)

  • Interior Permanent Magnet Machines (16 min)

  • Induction Machines (36 min)

  • Induction Machine Drives (31 min)




Heath Hofmann
Heath Hofmann
Professor, Electrical Engineering and Computer Science
More about...
A professor of electrical engineering at The University of Michigan, Heath Hofmann’s expertise lies in the areas of power electronics and electromechanical systems. Specific research interests include energy harvesting, flywheel energy storage systems, finite element analysis, and the design and control of electric machines.

Dr. Hofmann regularly teaches courses in power electronics and energy conversion, and has developed graduate and senior level courses in electromechanics and electric machinery and drives. His research has been sponsored by the Office of Naval Research, the Department of Energy, NASA, and the National Science Foundation, among others. He serves as associate editor to IEEE Transactions on Energy Conversion and the International Journal of Numerical Modelling: Electronic Networks, Devices and Fields.

Outside his university work, Dr. Hofmann has provided consulting services to a variety of businesses and institutions, including Tesla Motors.

Dr. Hofmann’s publications have appeared in prestigious journals such as IEEE Transactions on Industry Applications, IEEE Transactions on Power Electronics, and IEEE Transactions on Energy Conversion. He is currently writing a textbook, tentatively titled Electric Machinery and Drives, which will be published by Springer.

Dr. Hofmann holds a Ph.D. in electrical engineering from the University of California at Berkeley in 1998 and an M.S., also from the University of California at Berkeley, in 1997. He received his B.S. in electrical engineering from the University of Texas, Austin, in 1992.