Title :
Selection of short-circuit protection and control for Design E motors
Author :
De Vault, B. ; Heckenkamp, Daniel ; King, Todd
Author_Institution :
Cutler-Hammer, Milwaukee, WI, USA
Abstract :
The purpose of this article is to give users of Design E motors electrical application information concerning the selection of the appropriate motor disconnecting means, motor branch-circuit short-circuit protection, motor circuit conductor, motor controller and motor overload protection, and guidance concerning torque characteristics. The authors describe how motor efficiency is increased and how the design changes related to increased efficiency affect the mechanical and electrical characteristics of motors. They also review the requirements of Article 430 of the 1996 National Electrical Code and provide generic application tables that compare the protection and control requirements of Design E motors with those of Designs B, C, and D
Keywords :
electric motors; machine control; motor protection; short-circuit currents; Design E motors; National Electrical Code; disconnecting means; electrical characteristics; generic application tables; machine control; mechanical characteristics; motor branch-circuit; motor controllers; motor efficiency; selectrion guidelines; short-circuit protection; torque characteristics; Circuits; Code standards; Conductors; Copper; Costs; Induction motors; Protection; Rotors; Stator cores; Torque;
Journal_Title :
Industry Applications Magazine, IEEE
DOI :
10.1109/2943.758899
