Motors and Drives

Motors and Drives July 12, 2001

Research Shows Copper Rotor Efficiencies for Motors

Motors using new die-cast copper rotors can reduce energy loss by 15 to 23 percent, compared with the current industry-standard motors using aluminum rotors, according to the Copper Development Association (CDA), New York.

By Staff
Motors and Drives January 1, 2001

Modifying Engine Exhaust for Savings

Electric and steam-turbine drives for chillers are common practice. However, the use of gas-engine-driven chillers, particularly in a high-rise city building, is unique.When it came to a chiller retrofit for the Time & Life building in Manhattan, this selection required an analysis of the gas-engine exhaust, noise and vibration potential and the cooling tower and riser capacity.

By Consulting Specifying Engineer Staff
Motors and Drives October 1, 2000

Variable Speed at Alliant Energy

Using the basic design concepts employed at Harley-Davidson University (see page 28), an enhanced version was developed for the Alliant Energy World Headquarters located in Madison, Wisconsin. This 320,000-square-foot building currently under construction is a working model for the efficient energy-management policy of this utility company.

By Consulting Specifying Engineer Staff