Many industrial and domestic applications, computers, office equipment and instruments require small single-phase auxiliary electric motors rated up to 200 W fed from 50 or 60 Hz single-phase mains. Applications, such as fans, sound equipment and small water pumps were a decade ago the exclusive domain of the very low-efficiency shaded pole induction motor. Owing to cost-effective magnets and power electronics, PM brushless motors can successfully replace cage induction motors. Higher efficiency and smaller sizes of PM brushless motors reduce the energy consumption, volume and mass of apparatus.