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DC fans, or direct current fans, are non-polarized motors that are designed to be driven by direct current. They come in a variety of shapes and sizes and are widely used in many applications such as computer cooling, industrial machinery, air circulation in automobiles, and ventilation systems. They are typically divided into two types: Brushless DC fans (BLDC fans) and Brushed DC fans (BDC fans).

The core of a DC fan is its stator and rotor. The stator is a stationary part which consists of the fan\'s power cables, wound windings, and permanent magnets. The rotor is a spinning part which consists of the fan blades and a central shaft.

The core principle underlying the working of a DC fan is electromagnetism. When a direct current is applied to the fan\'s stator, a magnetic field is generated. The interaction between the stator magnetic field and the rotor creates the necessary mechanical force to move the fan blades, thus cooling the system.

The design of DC fans allows them to be used in a variety of applications in both large and small scale. In industrial machinery, they are used for cooling turbines and other machinery on heavy processing loads. DC fans are also becoming increasingly popular in personal computing, where they are used to increase airflow for cooling CPU chips and other sensitive parts. Another application of DC fans is for ventilation in automobiles, where they are used to circulate air within the cabin of the vehicle.

DC fans operate on the principles of electromagnetism and are very reliable and cost effective. They can be used for a variety of applications, which makes them an ideal choice for many industries and applications. For improved performance and increased efficiency, DC fans can be used in conjunction with a motor controller.

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