Q. Are high-speed motors better than low-speed motors?

Answer

From a production standpoint, a high-speed motor has a better power factor and efficiency than a low-speed motor of the same rated power because its electromagnetic torque profile is smaller at the higher speed. Equipment costs will rise and transmission losses will be greater. Therefore, it is important to evaluate the options available. Certain low-lift, high-flow pumps require low-speed pumps. Both the bore size and the impeller diameter are comparable or better. The transmission ratio and the needs of the drag generating machine determine the motor's rated speed.