"Small Cooling Fan" In operation, the rotating blades odd pieces, the weight of several blades varies, the weight of the fan blade, the more consistent effect on the airflow, the more stable, less vibration. Second, there may be a core shaft and bearing friction, resulting in DC fan vibration. "Small Cooling Fan" The best solution is to vibration in the open mold, the mold to achieve sufficient precision, balance the blades do the best, followed by the remedy is to produce balanced, targeted at the "Small Cooling Fan" fan increase in the removal of some of the leaves excess compound. For the shaft and bearing friction problem, adjust the size of a DC fan assembly on it.