AC Motors and Drives

This module introduces the student to the fundamentals of alternating current motors and AC variable speed control systems. In addition to the basic introduction motor, the module also covers servo-, universal and synchronous motors. The principles of variable frequency drives and their control circuits are presented emphasizing practical applications and troubleshooting techniques. Theoretical areas of study include single-phase and shaded-pole induction motors.

Learning Outcomes:

Upon completion of this module the student will be able to:

  • List the three classifications of single-phase motors.
  • Explain the basic operating principle of the induction motor.
  • Define synchronous speed and slip.
  • Describe the difference between starting torque and breakdown torque.
  • Name the three types of induction motors.
  • List three advantages of universal motors over induction motors.
  • Define speed regulation.
  • Describe the difference between pulse-width modulation, pulse-amplitude modulation and pulse width control.
  • Explain the difference between a cycloconverter and an inverter.
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