... 30W. Mains features of External Rotor Brushless DC Motor controllor Using Brushless DC Motor energy-saving 30%~40% compare ... No noise, hall-free, power,etc.Applications: External rotor motor, centrifugal fan, centrifugal blower, axial fan in HVAC, ... etc.Applications of External Rotor Brushless DC Motor controllor:External rotor brushless dc motor, EC motor, energy saving motor, DC and EC Centrifugal ...