As a key component of "220V AC Cooling Fan" kinetic energy into electrical energy, stable and reliable high-quality fan motor must have a fundamental condition. Brush less DC motor is a typical mechatronic products. Because "220V AC Cooling Fan" with low noise, smooth running, no commutator (ie brushes, it is also the name of "brush less" origin), speed monitoring convenient features, in various DC environment is widely used, has basically replaced the earlier series excited DC motor commutation, "220V AC Cooling Fan" in the air-cooled radiator and other computer accessories is becoming the standard selection.