The low voltage motors market is highly consolidated, with the top five participants accounting for more than 75 percent of the market revenues as of 2009. Low voltage alternating current (AC) motors dominate the industry, generating 92.1 percent of market revenues for 2009. That number is expected to increase to 95.9 percent by 2016, with a Combined Annual Growth Rate (CAGR) of 7.6 percent between 2006 and 2016. Low voltage direct current (DC) motors, on the other hand, are expected to have a negative 3.4 percent CAGR between those years.

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

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.

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

The Energy Independence and Security Act of 2007 (EISA), which restates and broadens the definition of General Purpose Electric Motors, goes into effect on December 19, 2010.

Because operational costs ride on efficiency determinations, accurate measurements of losses occurring within the motor are paramount. The reliability of efficiency data is key to any energy-savings plan, and knowing the meaning behind the rating can make or break a smart purchasing decision.

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

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

A large wastewater processing plant experienced continual problems with its influent raw wastewater pumps for several years.

A paper or an electronic work order system can be used to capture alignment data.

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.

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.

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

For the first time, the United States Department of Energy (DOE) adopted energy conservation standards for small electric motors in February 2010.

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.