"Fan Speed Controller superstructure" that "Mini Air Cooling Fan" a governor upper lid, and is a part of the fan. In industry, the cover is a fan speed controller using the "Fan Speed Controller superstructure injection mold" to achieve mass production. "Fan Speed Controller superstructure injection mold design", using the UG software to design "Mini Air Cooling Fan" superstructure governor injection mold. "Mini Air Cooling Fan" governor cover, the material is polypropylene (PP), polypropylene (PP) material with good high-frequency insulation, insulation from humidity, water absorption, has a certain strength and hardness, good liquidity, good molding process is widely used in mechanical parts, insulating parts.