Discharges flowing through the bearings put motors at risk.
Q. Are the pump motors special for VFD operation or can any motor be used with a VFD? A. Yes. Today there are special motors that are rated to be used with a VFD. They are commonly called...
The Benton/Washington Regional Public Water Authority saved on energy costs and gave dependable service to its customers after replacement.
Revisiting the fundamentals of data examination, time and resolution can solve equipment issues before they happen.
Power factor (PF) is an important component of an alternating current (AC) circuit, but understanding its actual effect can be difficult. Why is PF mysterious to many of us? It has to do with the way...
In my July 2014 column, I demonstrated that three-phase voltage variation can significantly affect several alternating current (AC) motor characteristics. If that variation is large, it can also...
How do end users choose, and what are each type’s ideal applications?
Trusted gateway connections allow for system growth, efficiency and consistent maintenance at Swedish paper mill.
In my June column on pump and motor testing, I said that three-phase voltage variation and unbalance can have a significant effect on motor insulation life. Voltage variation is defined as the...
Manufacturers and operators produce, purchase and use better motors with regulated testing.
Price, operating costs and reliability are key factors in any TCO calculation.
The best option for preventing bearing currents depends on the source of the problem.
The updated regulations may require machine redesign and premium efficiency motors and components.
These are the details of the snowmaking machines used during the Winter Olympics in Sochi, Russia.
Price, operating costs and reliability are key factors in any TCO calculation.
Previous articles in this series explained how oversized piping systems can have higher operating and maintenance costs. Higher maintenance costs can adversely affect the reliability and uptime of...
Guidelines for reduced vibration and information on how a pump’s foundation and operating speed affect the vibration response
Ease of installation, improved algorithms, enhanced displays, onboard communication and other technology make VFDs an ideal and cost-effective solution.
The construction, seals and protective monitoring contribute to the motor’s ability to operate in and under water.
Use a mathematical model that estimates vibration at the top bearing of a motor used on a vertical, wet-pit, column type pump.
In 2011, I wrote a five-part series on alternating current (AC) motors and motor efficiency. This column will go into more detail about the impact of efficiency. Efficiency defines how well a motor...
Advanced VFD technology delivers cost and space savings by providing protective features and minimal programming.
A dewatering facility brings a centrifuge up to speed slowly, meeting the long acceleration time requirement.
A VFD and a permanent magnet, direct-drive motor replace a gearbox, reduce maintenance costs and provide energy savings.
Why Wye? Why Delta?
Last of Three Parts
VFDs Save Energy in Pump Applications
Using variable frequency drives provides many benefits to end users.
Electric Motor Repair & Reliability
Repetitive motor failures may be caused by a lack of diagnostic or forensic repair information reported to the motor owner.
Long-Term Motor Reliability
A variable frequency drive’s effect on system efficiency and motor life
Internal Clearance & Its Effect on Bearing Fatigue Life
End users must include bearing clearance as an integral part of designing or building a pump.