Latest Motors Articles

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.

Following the development of variable frequency converter drives during the 1990s, totally enclosed fan-cooled (TEFC) AC induction motors became viable options for replacing DC motors in pumping applications. The torque and speed characteristics of these motors are a close match to those required for centrifugal pumps.

This month we will quickly look at the load types that comprise a typical AC circuit.

I received many comments on my four-part series on AC Power, and most of them were very positive.

As a follow up on my AC Motors series, I thought it would be a good idea to provide a short overview of work, power and torque as it applies to the AC motor.

A number of choices are available when connecting pumps, fans and other rotating equipment to an electric motor. There are numerous mechanical and fluid coupling designs and, in some cases, a belt drive option is available.

Back in the early seventies, when I was in grad school, our government pledged to convert the U.S. measurement system to the metric system. A popular cartoon at the time showed a lab technician with a box of amputated human feet standing at the door of the supply room. The supply clerk was also holding a box, but his was full of volt meters. The caption was "Trading Feet for Meters." That was almost 37 years ago, and we still have most of those feet! I guess that I could say that we are still "inching" into the metric system.

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.

Aligning an electric motor coupled to a large air blower required multiple measurements.

All electric motors (motors) have a housing that contains the working components of the motor.

Water and wastewater systems in the United States use a tremendous amount of power.

The industrial motor world has a new specification available for defining the requirements of general purpose, severe duty motors in the 250- to 3,000-hp range.

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

Last month, we ended with a discussion of the relationship between peak and RMS (or effective) voltage.


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Upstream Pumping

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