Latest Motors Articles

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.

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.

With highly reliable electrical systems, protective relays may be called upon to operate very infrequently.

After spending money on a powerful new pump and the motor to run it, the next big decision is how to connect the two in a way that maximizes their efficiencies and protects them from normal wear and tear.

Proper alignment of the pump shaft with the driver can reduce vibration and significantly improve reliability.

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.

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

It has been said that Washington, D.C., is the home of the largest invertebrate population in the U.S.

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.

Energy is the largest ongoing cost of mixer operation, so it is vital to carefully consider the energy-to-thrust ratio (sometimes called the “water-to-wire” ratio) for each and every mixer application.

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Upstream Pumping

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