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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


Optimized Power-Demand Control System for Electric Motors

Heating, Piping, Air Conditioning Engineering, Mar. 2016, by Alexander L. Burd and Galina S Burd.
http://hpac.com/motors-drives/optimized-power-demand-control-system-electric-motors

"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.
http://www.maintenancetechnology.com/2016/03/prevent-motor-bearing-failures-2/

"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.
http://tinyurl.com/ztupl99

"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.
http://www.maintenancetechnology.com/2016/02/select-the-best-vfd-for-your-application/

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

Why Electric Motors Fail

Flow Control Magazine, Jan. 2016, by Paul J. Barna.
http://www.flowcontrol-digital.com/201601#&pageSet=13

"Electric motors top the industrial landscape as the most widely deployed asset driving processes and productivity. In fact, industrial motor use accounts for about 25 percent of all electricity usage nationwide, according to the U.S. Department of Energy. Despite the dependence on these motors and their vital roles in industry, electric motors can fail for many reasons leading to losses in productivity and associated profitability."

Choosing the Proper VFD can Limit Harmonics

Pumps & Systems, Dec. 2015, by Jeffery Lovelace.
http://www.pumpsandsystems.com/pumps/december-2015-choosing-proper-vfd-can-limit-harmonics

"Facilities predominantly using these drives may face concern from power utility companies. Variable frequency drives (VFDs) have vastly evolved during the last 25 years.

System Considerations for VSDs in Industrial Machinery

Pumps & Systems, Nov. 2015, by Paul Stavrou.
http://www.pumpsandsystems.com/pumps/november-2015-system-considerations-vsds-industrial-machinery

"The changing landscape of hydraulic drives is leading many fluid power specialists to quickly adapt to VSDs."

Choosing Between Soft Starters & Adjustable Frequency Drives

Pumps & Systems, Nov. 2015, by Nichole Angiola.
http://www.pumpsandsystems.com/pumps/november-2015-choosing-between-soft-starters-adjustable-frequency-drives

"Motors often require large amounts of energy when quickly accelerating to full speed. Using soft starters and adjustable frequency drives reduce in-rush currents and limit torque—protecting valuable equipment and extending the motor's life by reducing motor heating caused by frequent starts and stops. Choosing between a soft starter and an adjustable frequency drive (AFD) often depends on the application, system requirements and cost, both for initial startup and over the life cycle of the system."

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."
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