Last year, a Pumps & Systems reader asked about matching variable frequency drives (VFDs) and motors.

Equipment and technology improvements can be sound investments.

In the food industry, stainless steel performs more productively and efficiently.

A simple mathematical model can be used to estimate vibration at the top of the motor in a vertical pump-motor structure.

Understanding resonance is essential for solving problems of increased vibration.

The biggest decision is determining which tolerances to align.

Cost-effective solutions reduce harmonics and improve system reliability, efficiency.

The benefits of these motors provide the flexibility needed for challenging pump applications.

Electric motors have had a huge impact on the pump industry.

Improved motor starters help Fabri-Kal achieve its green vision.

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Latest video coverage from EASA 2011

The SI system is the modern day version of the metric system, and the U.S. gets a lot of grief for not embracing its inherent transportability across international boundaries.

Owing partly to tradition, the shafts of electric motors are often larger than those of the equipment they drive.

Couplings are often forgotten until a project is nearing its end.

Advanced motor protective relays provide superior protection for motors and pumps. pump system optimization

A flexible coupling's primary functions are connecting two shafts, transmitting power from a driver shaft to a driven shaft and accommodating the misalignment between them.

Mechanical resonance occurs when an external source amplifies the vibration level of a mass or structure at its natural frequency.

It is impossible to balance line-to-line voltages perfectly in a three-phase circuit.

Last September, we spoke about the importance of pipe-to-piping alignment, evaluating actual numbers, and tabulating stress values as they approach yield stress of pipe at various values of misalignment. This time, we will discuss the effects of pump-to-motor misalignment, beyond hype or generalities, by numerically quantifying the conclusions.

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