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Introduction To DC Fans

DC fans are fans that require direct current (DC) as their power source. In contrast to AC fans, AC fans run on alternating current and can reverse their rotation direction depending on which way the current is flowing. DC fans do not possess this feature, and just rely on continuous current in one direction to spin in one direction.

9WS0812M401 Application Field and Working Principle

9WS0812M401 is a DC axial fan with a rated voltage of 12 VDC. It is designed for applications that require high airflow and static pressure, such as cooling of heat sinks, server cabinets, and power supplies. The fan size is 80mm and it has a noise level of 39.2 dBA. The fan\'s working principle consists of the four main components of a DC fan: the fan motor, the commutator, the brush, and the impeller.

Fan Motor

The fan motor is made of a spinning coil of wire inside of a magnetic field. When electricity is sent through the wire, it causes the coil to spin. Depending on the current direction and frequency, the motor will turn in either forward or reverse directions. The motor in the 9WS0812M401 has four poles, which creates a smoother rotation and better overall efficiency.

Commutator

The commutator is a disk-shaped piece made of conducting material (usually copper) that provides current to the spinning motor. It consists of several curved segments that are connected to the power source and the motor\'s wire coil, and its purpose is to reverse the current direction as the motor spins. This, in turn, reverses the motor\'s direction, allowing it to spin continuously in one direction.

Brush

The brush is a part that provides the connection between the power source and the commutator. It consists of a spring-loaded piece of metal that contacts the commutator segment as the motor rotates, thus providing the needed current for the motor to spin.

Impeller

The impeller is the part of the fan that actually creates the airflow. It is a circular piece made of plastic or metal that has curved blades that spin in the airflow as the motor spins. As the fan motor spins, air is drawn in and pushed out of the fan, creating airflow for cooling.

Conclusion

The 9WS0812M401 is a high performance DC axial fan that ensures efficient cooling of heat sinks, servers, and power supplies. Its four-pole motor provides a smoother running process, while its commutator and brush ensure a continuous current, allowing for continuous operation. The impeller creates airflow by spinning in the air and pushing it out towards the desired application, thus providing efficient cooling.

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