Motor selection made simple

摘要

ELECTRIC MOTORS OPERATE AT THEIR PEAK power factor and efficiency when fully loaded.So,you do not want to purchase a motor that is too big; common sense dictates that one that is too small is even worse.A few simple steps will help you select the right motor for your centrifugal pump application.Let's assume that the pump performance curve shown in the figure represents the pump that needs a motor.The first thing we must do is decide what diameter impeller to use.The figure shows impeller diameters from "A" to "E." The curves are marked with letters rather than numbers so that we can work the examples in either metric or English units.