Three-Phase Motors – Part 2

Three-Phase Motors – Part 2


This is the fourth lesson in the AC/DC Motor Theory Course. This lesson defines and explains the components and functions of externally excited motors, starters, and variable speed drives. There is also a review topic to reinforce the information covered in the lesson, Three-Phase Motors Ð Part 1.

Module Objectives

  • Explain the design of an externally excited motor.
  • Explain how an externally excited motor works.
  • Explain the function of a motor starter and the most common types of motor starters.
  • Describe a variable speed drive and its effect on voltage and frequency.


The AC/DC Motor Theory course was specifically developed for electricians and electronic technicians as well as for the multi-craft training needs of process and manufacturing facilities. This course consists of 11 interactive, on-line lessons that address AC and DC motor theory.


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