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Electricity 4: AC/DC Motors, Controls and Maintenance
Copyright 2009

Electricity 4
$105.95 $94.95


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Electricity 4
AC/DC Motors, Controls and Maintenance

Ninth Edition
Jeff Keljik

Obtain quick and easy access to information on DC and AC motors, various types of manual, magnetic, and electronic controls, and the installation and maintenance functions of each.

Updated to the 2008 National Electrical Code® and featuring safety references to the most current OSHA Safe Work policies, Electricity 4: AC/DC Motors, Controls, and Maintenance, 9th Edition provides practical, hands-on information to get the electrical system operating as well as the theory of “why” the system works to aid in troubleshooting.

The Ninth Edition features material on Variable Frequency Drives (VFDs) and newer controls for servo and small motors. Current practices and equipment have also been added to the Maintenance section to better enable readers to troubleshoot motors and control problems.


  • all material has been updated to bring the "state-of-the-industry" principles and practices to new and practicing electrical workers
  • more control systems using programmable controls and the use of electronic controls have been added to the advancement of control systems
  • current and past technologies are thoroughly examined to provide reference to older systems still in use and provide the necessary information to transition to newer systems
  • formulas and examples are explained step-by-step, and solutions are provided to reinforce processes and aid in application


 1. The DC Shunt Motor

 2. The DC Series Motor

 3. DC Compound Motors

 4. Summary Review of Units 1-3

 5. Manual-Starting DC Motors

 6. Electronic DC Motor Control

 7. Basic Principles of Automatic Motor Control

 8. The DC CEMF Motor Controller and DC Variable-Speed Motor Drives

 9. The DC Voltage-Drop Acceleration Controller

10. The DC Series-Lockout, Relay Acceleration Controller

11. Dynamic Braking with a DC Motor-Reversal Controller

12. Summary Review of Units 5-11

13. Electromechanical and Solid-State Relays and Timers

14. The Three-Phase, Squirrel-Cage Induction Motor

15. Starting Three-Phase, Squirrel-Cage Induction Motors

16. Controllers for Three-Phase Motors

17. The Three-Phase, Wound-Rotor Induction Motor

18. Solid-State Starters and Controls

19. Summary Review of Units 13-18

20. The Synchronous Motor

21 Three-Phase Motor Installations

22. Single-Phase Motor Installations

23. Energy-Efficient Motors

24. AC Series and Repulsion Motors

25. Selsyn Units

26. Motor Maintenance

27. Summary Review of Units 20-26



About the Author:

Jeff Keljik is a graduate of Dunwoody College of Technology and has a bachelor's degree from Metropolitan State University. He served as head of the electrical department at Dunwoody College of Technology from 1982 to 1998, and played an integral part in developing their Electrical Design and Management program.

The recipient of both the 1993 Kraemer Fellowship Award for new technology education and an award for International Technical Teacher Education, Jeff also holds a master's degree and a Journeyman's class 'A' license from the State of Minnesota.

He is an Executive Board Member for the North Central Electrical League and serves on the Education Committee for the Minnesota Electrical Association. Jeff has co-written many courses for NEC® updates, examination preparation courses, and apprenticeship materials.

384 Pages - 7-3/8 x 9-1/4 in.


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