ELEC-145: AC/DC Rotating Machinery

Business, Entrepreneurship, & Professional Development
Electrical Technology
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.

Goals, Topics, and Objectives

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

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.

Approval Dates

Effective Term
Fall 2020
ILT Approval Date
AALC Approval Date
Curriculum Committee Approval Date