Ecm Fan Motor Pulsed with Energy Return
Channel: debunkified
Date: 2018-04-01

ECM's (Electronically Commutated Motors) can be up to 90% efficient. I believe that this figure is mechanical in nature as most of the input energy is transferred, or at least has the ability to transfer most of the energy, directly into the rotor in order to rotate it, hence the 90%. 

Energy is pulsed into the stator coils and returns electrical energy from the collapsing electromagnetic field during the shut off phase of the switching cycle. It is believed that the combination of mechanical energy in 'addition' to the electrical energy together is more energy than what goes into the device.

This is a little debatable  because a balance must be found in between the mechanical and electrical energy. The stator coils suggest that most of the input energy is transferred into the rotor magnets hence again the 90% electromagnetically efficiency. Just think if just 11% electrical energy can be returned then this could represent 101% efficiency. Again the the total efficiency is the combination of both the mechanical and electrical energy.

The stator coil's cores are in front of and connected to the back ends of the stator coils in order to capture the 'entire' electromagnetic field of the stator coils or both poles. Along with the rotor magnet being just one large circular magnet, it's hard to not to imagine that all of the input energy is successfully being transferred into the rotor magnet and rotor to motorize it with 90% efficiency.