Large ac motors offer power-dense design for hazardous locations

The AXR 5000 and 5800 large AC NEMA motors from ABB are said to deliver an average of 15 percent more horsepower per pound over conventional TEFC designs but with a smaller frame size in some power ratings.

This helps save space, ABB says, up to 8 inches in overall length in some cases, which enables more compact installations on oil platforms and in refineries.

The new AXR motors are also said to offer improved cooling, a critical factor to extend the life of the motor. An internal cooling loop circulates air inside the motor, moving heat to the frame.

An external fan blows air over the frame to remove the heat. The IP65-rated units also meet American Petroleum Institute 541 and 547 standards for motors operating in the oil and gas industry.