Title :
Increased Efficiency Versus Increased Reliability
Author :
Bonnett, Austin H. ; Yung, Chuck
Abstract :
The vast majority of totally enclosed fan cooled (TEFC) squirrel cage induction motors in the 1-to 20-hp range installed in the petroleum and chemical industries are National Electrical Manufacturers Association (NEMA) "T" frames built prior to 1992, NEMA "T" frames built in accordance with the Energy Policy Act of 1992 (commonly referred to as EPAct motors), and the NEMA Premium motors, introduced after the year 2000, that exceed the EPAct efficiency standards. All three types are available in accordance with the IEEE 841 recommended practice and standards. The most obvious difference in these three generations of motors is their efficiency levels. There has been some concern expressed by the users of these motors that to achieve the premium levels of efficiency it was necessary to compromise other performance characteristics and the motor reliability. This article addresses these claims and shows that they are without basis.
Keywords :
IEEE standards; squirrel cage motors; EPAct efficiency standards; EPAct motors; Energy Policy Act of 1992; IEEE 841 standards; NEMA Premium motors; NEMA T frames; National Electrical Manufacturers Association; chemical industries; motor reliability; petroleum industries; totally enclosed fan cooled squirrel cage induction motors; Chemical industry; Failure analysis; Helium; Induction motors; Iron; Life testing; Manufacturing; Performance analysis; Petroleum; Voltage;
Journal_Title :
Industry Applications Magazine, IEEE
DOI :
10.1109/MIA.2007.909802