For use on turbine, mix flow and propeller pumps
3 - 4000 Horsepower
3600 through 514 rpm
Low and medium voltage through 6900 volts
Three phase, 60 and 50 hertz
Three efficiency levels - standard
efficient, energy efficient
and premium efficient

Product Overview
Our Weather Protected Type I (WPI)
Holloshaftâ motors are constructed to minimize the entrance of rain, snow and airborne particles. Our enclosures exceed NEMA requirements because U.S. Motors has built in the extra protection needed for rugged outdoor applications. The ventilation system is designed to provide optimum cooling to the thrust bearing and electrical components and is available in all motor sizes.
These motors allow for easy pump impeller adjustment and maintain alignment of pump base to motor drive clutches. Steady bushings are available to give the mechanical characteristics of a solid shaft motor.
In our design concept, the high thrust vertical motor is arranged into four functional zones - the top zone is small and light to assure simplified access to the coupling area and inspection of the thrust bearing. Below this is the coupling area and the essential elements of thrust bearings with a large weather protected air intake to cool the motor and thrust bearing.
Next, the center, or winding section, develops the driving torque and includes the latest Insulife insulation systems. And below, the mounting base is compact and designed for momentary upthrust of the pump.
The benefit of the four zone design is a motor which is more easily installed and serviced and which allow operator protection and convenience.