Motors and Drives

Motors and Drives January 1, 2001

VFDs Control Costs for Cement Plant

The commissioning and start-up of a Lone Star Industries cement plant in Greencastle, Ind., last June marked the introduction of the semi-dry cement-making process in the United States. It is because of good availability of relatively inexpensive electricity, and the plant's energy efficiency...

By Staff
Motors and Drives January 1, 2001

M/E Roundtable: Cooling Data and Dot-Coms

As data centers, clean manufacturing and telecommunications come to dominate many an engineer's design work, unique issues are impacting heating, ventilation and air-conditioning (HVAC) systems. From air purity and cable management to thermal decay and fire suppression, mechanical designers must...

By C.C. Sullivan
Motors and Drives November 1, 2000

A Better Approach to Harmonics Considered Too High?

I read with interest the Specifier's Notebook, "Moving Harmonics Out Of Harm's Way," in the October issue of Consulting-Specifying Engineer. Having written an article on harmonics ("Waving Goodbye to Harmonics," (February 1996), I always take an interest in other viewpoints.

By Staff
Motors and Drives November 1, 2000

Answering the Central Question

Examples of centralized and distributed strategies permeate our environment. Even our own bodies are arranged with a central cardiopulmonary apparatus, widely distributed sweat glands and regional lymph nodes.

By George P. Karidis, P.E. and John D. Richards, P.E. SmithGroup Detroit
Motors and Drives October 1, 2000

Moving Harmonics out of Harm’s Way

Are harmonics refusing to jibe with the harmony of a facility's power flow?In the old days of predominantly linear loads, harmonics were a natural occurrence that didn't cause problems because with normally balanced, three-phase AC systems that have nondistorted waveforms, the harmonic currents got cancelled out.

By BARBARA HORWITZ, Associate Editor
Motors and Drives October 1, 2000

Chiller Upgrade Adapts to New Uses

As one of the nation's largest firms involved in consumer and commercial credit reporting as well as credit-card and check transactions, the professionals at Equifax Inc. understand money. Upon learning that the upgrade of one of the facility's chillers could reduce operating costs at its St. Petersburg, Fla.

By Staff