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Energy Newsbriefs Blog

This current awareness service is prepared by the WSU Energy Program Library with funding from the U.S. Department of Energy State Energy Program. This information is provided for energy professionals and interested members of the public to highlight recent energy-related news, articles, and reports that discuss energy efficiency, energy conservation, and renewable sources of energy in engineering and policy circles.


Category: Motors/Drives


Energy Management Considerations With Today’s Drive Systems

Compressed Air Best Practices, Oct. 2016, by Michael Perlman.’s-drive-syst

"It is a fact that most of the energy loss in a system occurs in three areas, namely, the generation, distribution and conversion of energy into useful work, the last being accomplished through heat exchangers, pumps, motors and drives.  This paper will concentrate on the last product group."

How Do You Size a VFD?

Flow Control, Sept. 2016, by Jeff Bergman and Sean Fitzpatrick.

"Confusion often surrounds the proper sizing of variable frequency drives (VFDs), and sometimes, knowing when and how to choose one may be difficult. Actually understanding what a VFD does might make this decision easier and the requirements less difficult to understand."

German [Wastewater] Plant Upgrades Drop Specific Energy Use by More Than 50 Percent

Pumps & Systems, Sept. 2016, by Erkki Lantto & Stefan Wilken.

"In the city of Sögel, Germany, one municipal wastewater plant employs turbocompressors to reduce its operating costs and cope with load fluctuations. The setup’s success comes from an advanced design with proven magnetic bearing technology and a high-speed motor. The plant treats domestic wastewater and industrial wastewater from nearby food industry factories."

Innovations in Motor Technology Spark Energy Efficiency

Business Energy, Jul/Aug 2016, by Patrick J. Piper.

"With minimum efficiency regulations increasing two to three times every decade, the engineering preference to make motors more efficient is coming to the fore. Motor manufacturers have been trying to improve the efficiency of their motors for years, however there hasn’t been a new technology to rival ECM motors in efficiency and performance."

Premium Power Drive Systems

Heating, Piping, Air Conditioning Engineering, Aug. 2016, by Rob Boteler.

"Increasingly in industrial and commercial HVAC applications, electric motors are being combined with power converters to form premium power drive systems (PPDS). When used in variable-flow applications, PPDS can deliver savings unmatched by mechanical speed/flow-control systems."

Motors: The Proactive Approach To Voltage Unbalance

Engineered Systems, June 2016, by Thomas H. Bishop.

"Once we distinguish voltage unbalance from voltage variation, the need to tackle the issue intelligently becomes even more clear. Learn about common causes and effects, testing for unbalanced voltages and single-phasing, and ways to correct the problem if it does manage to arise."

Optimized Power-Demand Control System for Electric Motors

Heating, Piping, Air Conditioning Engineering, Mar. 2016, by Alexander L. Burd and Galina S Burd.

"During off-design load conditions, use of variable-frequency drives (VFDs) reduces electric-motor power demand. At design and near-design loads, however, it has the opposite effect. Widespread application of VFDs, then, might cause an increase in the design power demand of electric utilities, forcing them to administer mandatory consumer power-demand-shedding programs. An increase in design power demand over installed power capacity might lead to other negative consequences, such as electric-utility power outages, consumer productivity losses, and increased environmental pollution. This article demonstrates how automatic switchover from VFD control mode to VFD-bypass control mode and back can help to mitigate, if not eliminate, these negative impacts."

Prevent Motor Bearing Failures

Maintenance Technology, Mar. 2016.

"Understanding the top five causes of failed motor bearings will help stop these problems in their tracks."

Electric Motor Efficiencies and VFD Compatibility

ASHRAE Journal, Feb. 2016, by David A. John.

"When consulting engineers select and specify fans for HVAC systems, they often specify that the motor for a fan should be a premium efficiency motor. this is critical because most variable frequency drives (VDs) require a premium efficiency motor."

Select the Best VFD for Your Application

Maintenance Technology, Feb. 2016.

"According to the technical experts at Mitsubishi Electric Automation, Vernon Hills, IL, there are several factors to consider when selecting variable-frequency drives (VFDs)."
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