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This three part primer is a basic introduction to AC power for those in the pump industry who need a place to start. It will also provide several web references to access if you would like to further your understanding of this interesting and essential topic.

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

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

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

Significant energy and money savings are realized when using variable speed motors controlled with drives.

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.

Introduced in June 2010, Super-E Motors with AEGIS Shaft Grounding Ring are used in commercial and industrial applications.

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

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.

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.

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

Named for a technique commonly used on failing pumps, "percussion maintenance" - where a technician beats on the pump's stalled motor with a hammer or rubber mallet - often indicates motor deficiencies in his diaphragm pump.

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.

Data-driven visibility helps protect industrial processes and motors.

Last month, we studied the properties and effects of resistive, inductive and capacitive loads in an AC circuit.

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

Although a number of AC motor designs are used, the induction motor is, by far, the most common and will be the topic of this column.

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.

Energy efficiency may not always mean total efficiency.

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