An EC-Motor is a synchronous electric motor where the rotation rate of the shaft is synchronized with the stator‘s magnet field. Synchronous external rotor motors contain permanent magnets inside the rotor. The rotor position is detected by Hall effect Sensors and the current flow through the stator winding is energized by a semiconductor stage according to the rotor position in order to produce torque. The rotor does not rely on “slip”. It always turns in step with this field, at the same rate