ELEC-145: AC/DC Rotating Machinery

Business, Entrepreneurship, and Professional Development
Adv Manufacturing/Fabrication
Electrical Engineering Technol
Academic Level
Course Subject
Course Number
Course Title
AC/DC Rotating Machinery
Credit Hours
Instructor Contact Hours Per Semester
62.00 (for 15-week classes)
Student Contact Hours Per Semester
62.00 (for 15-week classes)
Grading Method
Catalog Course Description

Focuses on theory and application of D.C. motors and generators, A.C. alternators, and single-phase and three-phase induction motors. Also covers single-phase and three-phase transformers. Includes laboratory activities with verification of several circuit principles. Extensive laboratory activities.

Goals, Topics, and Objectives

Core Course Topics
  1. Introduction to D.C. motors and D.C. generators. Includes lab.
  2. Lab demonstration of types of D.C. generators
  3. Fundamentals of the D.C. generator. Includes lab.
  4. Generator characteristics. Includes lab.
  5. Load characteristics of a shunt and compound D.C. generator. Includes lab.
  6. Effect of speed on shunt generators. Includes lab.
  7. Load characteristics of a self-excited shunt and compound generator. Includes lab.
  8. Counter E.M.F. of a D.C. motor. Motor torque and horsepower. Includes lab.
  9. Fundamental motor equation.
  10. D.C. motor characteristics and loading effects. Includes lab.
  11. D.C. shunt motor and series motor loading conditions. Includes lab.
  12. Introduction to single-phase transformers. Includes lab.
  13. Coil polarities and transformer ratios. Includes lab.
  14. Single-phase transformer relationships. Includes lab.
  15. Transformer open- and short-circuit tests, single-phase transformer efficiency. Includes lab.
  16. Three-phase transformers. Includes lab.
  17. Delta & Wye configurations. Includes labs.
  18. Transformer three-phase – open Delta connection. Includes lab.
  19. Three-phase transformer loads. Includes lab.
  20. Power factor correction.
  21. Three-phase transformer problems.
  22. Three-phase (poly-phase) induction motor – squirrel cage. Includes lab.
  23. Three-phase induction motor characteristics and performance. Includes lab.
  24. Load characteristics of the squirrel cage induction motor. Includes lab
  25. Starting and running characteristics of a squirrel cage induction motor. Includes lab.
  26. Running characteristics of the three-phase squirrel cage motor (no-load condition, locked rotor test, loaded condition). Includes lab.
  27. Determining starting torque using locked rotor method of squirrel cage motor. Includes lab.
  28. Starting characteristics of the squirrel cage induction motor. Includes lab.
  29. Three-phase motors and circuit conditions. Includes lab.
Core Course Learning Objectives (Separated)

As a result of this course the student will be able to:

  1. Practice safety precautions and procedures when wiring and operating D.C. and A.C. rotating machines and induction type devices.
  2. Identify the components of a D.C. motor and a D.C. generator as it relates to their physical construction.
  3. Analyze, define, and understand the various common D.C. motor circuits and wiring configurations.
  4. Analyze, understand, and explain the principles of operation of a D.C. motor.
  5. Analyze the various common D.C. generator circuits and wiring configurations.
  6. Analyze the principles of operation of a D.C. generator.
  7. Analyze the loading effects on both D.C. motors and D.C. generators.
  8. Analyze the principles of a single-phase transformer for both step-up and step-down applications.
  9. Explain the construction and principles of operation of both a DELTA and a WYE three-phase transformer.
  10. Understand the construction and operation of a three-phase squirrel cage induction type motor.
  11. Analyze connections of DC and AC motors to determine operation and functionality.
  12. Analyze connections of single phase and three-phase transformers to determine operation and functionality.

Assessment and Requirements

Assessment of Academic Achievement
  1. Unit and chapter tests given throughout the semester. Tests represent 50 percent of the course grade.
  2. Informal and Formal laboratory activities and performance exercises in which students demonstrate an understanding of assigned circuits. Formal laboratory activities are submitted as a written report and represents 25 percent of the course grade.
  3. Final exam in which common questions are asked covering the units and topics presented throughout the semester.The final exam is worth 25 percent of the course grade.


Satisfies Wellness Requirement

Approval Dates

Effective Term
Winter 2022
ILT Approval Date
AALC Approval Date
Curriculum Committee Approval Date