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.
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 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.