... power 30W. Mains features of External Rotor Brushless DC Motor controllor Using Brushless DC Motor energy-saving 30%~40% compare to AC ... be customized according to customer demands, such as Supply voltage range, No noise, hall-free, power,etc.Applications: External rotor ... External rotor brushless dc motor, EC motor, energy saving motor, DC and EC Centrifugal fan, DC and EC axial fan, DC and EC ...