1. vibration if "220V AC Cooling Fan" center of mass and rotation of the rotor shaft physical inertia center of the rotor is not on the same axis, it will cause the rotor imbalance. Recently physical distance centroid center of inertia of the rotor and the shaft is called the eccentricity of the rotor does not cause eccentricity value, when the rotor is rotated due to the action of centrifugal force generates a force to the shaft holder formed vibrating, and the vibration is transmitted to the base path via mechanical various parts.
2. "220V AC Cooling Fan" different tone sounds only pure wind wind noise, and different sound is different, when the fan is running, in addition to the wind, but if there are other sound, you can determine the fan has different tone. Abnormal noise may be due to a foreign body or the bearing deformation, and collision improper assembly, or motor winding is wound unevenly, resulting in loose, are likely to produce different sounds. "220V AC Cooling Fan" of life means the life of the fan radiator working time between failures, high-quality products can reach tens of thousands of hours of life in general.