The 3 Pin DC Axial Brushless Fan is a mainstream wired brushless heat dissipation fan with three-pin wiring design, which integrates power supply, grounding, and speed signal output functions. It is one of the most widely used universal cooling fans in the electronic heat dissipation industry. Compared with two-pin fans that only support fixed-speed operation, the 3-pin DC axial brushless fan adds a dedicated tachometer signal pin, which can output real-time fan speed pulse signals to the equipment’s main control board, realizing real-time monitoring of fan operating status for intelligent equipment, greatly improving the safety and intelligence level of the heat dissipation system. In terms of wiring function definition, the three pins of the fan correspond to DC power supply positive pole, power supply negative pole (grounding), and speed signal output respectively. The wiring definition is unified and standardized, which is compatible with the mainstream main control boards of computers, industrial control equipment, and smart home equipment on the market, realizing plug-and-play and convenient installation and replacement. The real-time speed signal output function enables the equipment system to accurately obtain the fan’s rotating speed data. Once the fan has abnormal speed reduction, stalling, or stop failure, the system can immediately trigger an alarm or start emergency protection measures, effectively avoiding equipment overheating damage caused by fan failure. In terms of core performance, this 3-pin brushless DC axial fan adopts a high-precision brushless motor drive system, abandoning the traditional brushed motor’s vulnerable carbon brush structure, with longer service life, lower noise, and more stable operation. The optimized aerodynamic blade and air duct design ensures efficient air volume output under different speed conditions, meeting the heat dissipation needs of different power electronic equipment. The fan supports multiple voltage specifications of 5V, 12V, 24V, and 48V, with complete size models (3010, 4020, 5015, 7015, 8025, 12038, etc.), covering miniature consumer electronics, household appliances, and large industrial equipment heat dissipation scenarios. In terms of stability and safety, the fan has built-in over-current, over-voltage, reverse connection, and locked-rotor protection circuits, which can effectively resist voltage fluctuation and current impact in the working process and avoid fan burnout and equipment damage. The high-quality bearing system (oil-impregnated bearing or double ball bearing) ensures long-term stable operation, with a maximum service life of up to 70,000 hours. The whole machine complies with RoHS environmental protection standards and passes CE, FCC and other international certifications, with safe and environmentally friendly materials and no electromagnetic radiation pollution. In terms of intelligent application advantages, the real-time speed monitoring function of the 3-pin fan makes it especially suitable for intelligent equipment that requires high heat dissipation reliability, such as computer motherboards, server chassis, industrial control hosts, and precision medical equipment. The equipment system can judge the operating state of the cooling system through the fan speed data, realize linkage control with the equipment temperature, and lay the foundation for subsequent intelligent temperature control and speed regulation. In terms of market applicability, the 3 Pin DC Axial Brushless Fan has high universality, low failure rate, and convenient after-sales maintenance. It is the most mainstream matching fan for most medium and high-end intelligent electronic equipment, and is widely recognized and adopted by equipment manufacturers in various industries.