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.

All electric motors (motors) have a housing that contains the working components of the motor. In the U.S., the enclosure describes this housing.

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.

Due to the expense and labor required, most facilities need to maximize the life of their motors.

Most of us probably never notice the spinning cylinder mounted between the pump and motor, except how easy it is to dis/assemble when a pump or motor is changed out.

Because operational costs ride on efficiency determinations, accurate measurements of losses occurring within the motor are paramount.

Energy efficiency may not always mean total efficiency.

The pump industry is the largest purchaser of electric motors in the United States.

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

Mechanically generated sparks, electrostatic discharge and high surface temperatures are all potential ignition sources in explosive atmospheres.

When maintaining motors, proactive strategies are required.

Due to the expense and labor required, most facilities need to maximize the life of their motors. Electrical, insulation resistance and thermal measurement are three tests that can troubleshoot motors, drives and associ­ated electrical panels and prolong their operational lifetime. Ther­mal imagers can detect potential problems and insulation resistance and electrical tests can deter­mine the cause.

Construction features are key to vertical motor application and maintenance.

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

In June, 2007, a reader asked Electrical Apparatus magazine, "How long should motor bearings last?" The answer will astound you.

Unanticipated noise and vibration can be problematic for both occupants and processes within structures.

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.

Water and wastewater systems in the United States use a tremendous amount of power. The EPA estimates that these systems use 50 trillion watt-hours annually at a cost of $4 billion. Combined with electric rate increases upward of 20 percent in a single year, water and wastewater system operators are left with an enormous strain on their budget.

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