"220V AC Cooling Fan" radiator needs to accelerate heat dissipation by forced convection fan, so a fan of good or bad, on the whole cooling effect plays a decisive role. Equipped with an excellent performance of the CPU fan is one of the key factors to ensure the smooth functioning of the entire computer. If vibration "220V AC Cooling Fan" rotor inertia physical centroid and the center of the rotor shaft axis is not the same, it will cause the rotor imbalance. The nearest distance between the rotor center of mass with the physical center of inertia of the shaft is called the eccentricity of the rotor does not cause eccentricity value, when the "220V AC Cooling Fan" rotor due to the centrifugal force of a biasing force to the vibration generating shaft mount is formed, and mechanical vibrations transmitted through the various parts of the base path.