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

Volume

5

Issue

3

fYear

1999

Firstpage

26

Lastpage

37

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;

fLanguage

English

Journal_Title

Industry Applications Magazine, IEEE

Publisher

ieee

ISSN

1077-2618

Type

jour

DOI

10.1109/2943.758899

Filename

758899