Why and how do leading OEMs choose a variable speed motor for their equipment?

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

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

In the past year, the rate of acceleration in the cost of raw materials (including steel, iron ore, copper and aluminum) has reached unprecedented levels in the pump and rotating equipment industries.

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.

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

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

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

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

In the past year, the rate of acceleration in the cost of raw materials (including steel, iron ore, copper and aluminum) has reached unprecedented levels in the pump and rotating equipment industries.

An argument in favor of IEEE-841's provision for motor bearing protection.

The frame sizes (physical dimensions) of AC motors have changed substantially through the years. Originally, they were considerably larger than those in use today. This increased size was the result of inefficiency and the need to dissipate heat.

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.

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.

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.

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