Enhanced diagnostics provide critical data for reliable, efficient operations.
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...
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...
Pumps & Systems, June 2007Most of the electric motor information we use on a daily basis is pretty straightforward. Voltage, amps, efficiency, and service factor are all well understood terms in...
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.
Price, operating costs and reliability are key factors in any TCO calculation.
These are the details of the snowmaking machines used during the Winter Olympics in Sochi, Russia.
A VFD and a permanent magnet, direct-drive motor replace a gearbox, reduce maintenance costs and provide energy savings.
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...
Use a mathematical model that estimates vibration at the top bearing of a motor used on a vertical, wet-pit, column type pump.
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.
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.
Top-of-Motor Vibration
A simple mathematical model can be used to estimate vibration at the top of the motor in a vertical pump-motor structure.
A dewatering facility brings a centrifuge up to speed slowly, meeting the long acceleration time requirement.
Last year, a Pumps & Systems reader asked about matching variable frequency drives (VFDs) and motors. “I have a spare pump in my warehouse that requires 15 horsepower (HP) at best efficiency...
How Motors Have Changed the Pump Industry
Read more about The History of Pumps here. Electric motors have had a huge impact on the pump industry. While it is not certain how centrifugal pumps were powered in the early days, it is...
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.