... motor driverElectronically commutated motors can be connected direct to AC mains and have little more than half the power ... free, power,etc.Applications: External rotor motor, centrifugal fan, centrifugal blower, axial fan in HVAC,Tele-communication, refrigeration, clean room, IT ... No noise, hall-free, power,etc. power,etc. 230V AC three phase electronically commutated ec fan motor driver controller