DC Fans

DC fans refer to fans powered directly by a direct current source. Instead of utilizing precision windings, brushes, and a commutator like traditional DC motors, they usually use rare earth permanent magnets. This gives them improved reliability, longer working times, and usually a higher efficiency. An example of a DC fan is 9G1248H101.

Application Field

9G1248H101 is widely used in telecommunications, aerospace, automotive, and industrial applications. It is often found in instruments, ventilation systems, cooling equipment, and other cooling needs. With a compact size, it can fit into tight spaces and provide efficient cooling even at low speeds. Its motor is constructed with windings in low resistance, allowing it to start up quickly, reach high speeds, and maintain speed stability even when varying loads are applied.

Working Principle

The 9G1248H101 operates at an input voltage ranging from 4 to 12 VDC. It has a speed range of 2200 to 7500 RPM, is available in 12V and 24V models, and is tested for up to 2000 hours after being powered on. It has an airflow rating of 30 to 58 CFM. In a DC fan, the magnetic field is created by a neodymium rare earth magnet or an array of magnets. This magnetic field interacts with the windings on the motor’s stator. As the permanent magnets rotate, they create a magnetic field, causing current to flow in the windings. This results in the rotation of the motor, in turn producing airflow.

The 9G1248H101 utilizes dual ball bearings to improve stability. The fan blades are designed with curved vertical lines and blades slots to reduce the noise created when air is forced through them. The fan is equipped with short circuit protection, start and run current overload protection, stall current protection, and thermal protection.

Conclusion

The 9G1248H101 is an example of a DC fan with a wide range of applications. It has a high efficiency, and its motor operates smoothly at both low and high speeds. The fan is equipped with a variety of protections, and its design reduces the noise produced.