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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

Motors/Drives


10 Little-Known VSD Air Compressor Tweaks

Compressed Air Best Practices, Nov. 2015, by Ron Marshall for the Compressed Air Challenge.
http://www.airbestpractices.com/technology/compressor-controls/10-little-known-vsd-air-compressor-tweaks

"The introduction of rotary screw air compressors controlled by variable speed drives (VSDs) is one of the best energy efficiency innovations introduced to the industry in the past few years. This style of compressor control can significantly reduce the energy wasted by compressors running in the unloaded condition. But the type of VSD control offered by various manufacturers can differ, and some of these differences can affect the efficiency of the system. This article discusses some little known tweaks to VSD compressor control, including some using hidden features that can sometimes be implemented to enhance the savings gained by the installation of this type of compressor."

Energy Efficiency in Water & Wastewater

Pumps & Systems, Sep. 2015, by Jeff Bergman.
http://www.pumpsandsystems.com/pumps/september-2015-energy-efficiency-water-wastewater

"VFDs [Variable Frequency Drives] can reduce energy consumption and water loss in variable pumping systems."

Review of the DOE Final Rule for Integral Horsepower Motors

Pumps & Systems, Sep. 2015, by John Malinowski.
http://www.pumpsandsystems.com/motors/september-2015-review-doe-final-rule-integral-horsepower-motors

"At the end of May 2014, the U.S. Department of Energy (DOE) released the Final Rule that amends the regulation for integral horsepower motors. Until the rule takes effect June 1, 2016, motor manufacturers will continue to operate under rules from the Energy Independence and Security Act (EISA), which took effect in December 2010. This means that almost all low-voltage, three-phase motors sold for use in the U.S. will need to be premium efficiency per National Electrical Manufacturers Association (NEMA) MG 1-2014, tables 12-12 and 20B."

Cool Advice On Hot Motors

Maintenance Technology, Aug. 2015., by Jim Bryan.
http://www.maintenancetechnology.com/2015/08/cool-advice-on-hot-motors/

"The effects of excessive temperature on motor performance are notorious. After moisture, they are the greatest contributor to bearing and winding failures. Understanding the source of increased temperature is key to correcting the problem and improving the reliability of your facility’s motor fleet."

Balancing Software Conserves Energy in Multiple-Pump Systems

Pumps & Systems, Sep. 2015, by Kurt Bihler.
http://www.pumpsandsystems.com/pumps-instrumentationcontrols/september-2015-balancing-software-conserves-energy-multiple-pump

"Each adjustable speed drive can find its own set point independently without stressing the entire system. Process control through traditional adjustable speed drives (ASDs) with centrifugal pumps has an inherent problem of attempting to use a linear equation to solve a non-linear problem. Common ASD controller software provides an estimated speed to achieve a desired set point. But when the target speed is reached with this method, the set point is not available because the answer is on an unknown non-linear curve."

Troubleshoot Hot Hydraulics

Maintenance Technology, July 2015, by Jane Alexander.
http://www.maintenancetechnology.com/2015/07/troubleshoot-hot-hydraulics/

"High oil temperatures in industrial hydraulic systems can lead to a world of hurt. Don’t let them get you down."

Is a VFD a Cost-Effective Option for Your Application?

Pumps & Systems, July 2015, by Mark Berube.
http://www.pumpsandsystems.com/motors/july-2015-vfd-cost-effective-option-your-application

"While variable frequency drive (VFD) technology can significantly increase system efficiency by controlling pump speed, not every application requires a VFD. To determine when to apply this technology, end users must conduct detailed calculations to verify the cost-effectiveness of using a VFD."

VFD Trends and Solutions for Drive Systems

Plant Engineering, June 2015, by Alex Ward.
http://www.plantengineering.com/single-article/vfd-trends-and-solutions-for-drive-systems/c655baa26fc5bd8e9e7a4e700ce2b7c5.html

"The increase in variable frequency drive (VFD) installations across the globe has meant that drives are being applied in more challenging system environments. Not only is the environment challenging, but drives also have a few inherited issues that can limit the overall system performance. Harmonics mitigation, filtering voltage spikes are two key issues."

2 Simple Steps to Choosing the Right Motor

Pumps & Systems, June 2015, by Mike Stockman.
http://www.pumpsandsystems.com/motors/june-2015-2-simple-steps-choosing-right-motor

"Every pump industry professional faces the challenge of choosing the most efficient system for a particular application. This process is complicated by the uncertainties of efficiency regulations, mandates and parameters, especially when efficiencies alone do not tell the whole story. Sometimes the most efficient motor is not the best choice. By using two simple calculations, pumping professionals can determine the best motor—as well as the best pump and drive—for each application."

Developing a Pump System Assessment with Energy Cost Balance Sheets

Engineered Software, Inc., May 2015.
http://eng-software.com/company/press/2015/5/developing-a-pump-system-assessment-with-energy-cost-balance-sheets/

"The first step in the assessment involves developing an Energy Cost Balance Sheet for the way the system is currently operating.  We can then identify system improvement alternatives and develop an Energy Cost Balance Sheet for each proposed alternative.  These results provide the plant’s financial management team with the data needed to develop a course of action based on the potential risk/ reward."

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