When it comes to brushless DC fans, here are some more detailed information:

1. Working principle: The core of a brushless DC fan is a brushless DC motor. This motor uses permanent magnets to act on the rotor, and an electronic controller provides current on the stator to generate an electromagnetic field. The electronic controller senses the rotor position and switches the direction of the current accordingly, thereby achieving the rotation of the rotor. The rotating rotor drives the fan blades to rotate, thereby generating airflow.

2. Advantages:

1) High efficiency: Brushless DC fans have higher efficiency than traditional brushed DC fans. This is because the commutation of the brushless motor is carried out by the electronic controller, eliminating the friction and energy loss of traditional brushes and commutation rings.

2) Long life: The brushless design of the brushless motor means that there is no friction generated, thus reducing the risk of wear and mechanical failure. This means that the life of the brushless fan is longer.

3) Low noise: Brushless motors do not use brushes, so the noise level is low. This is ideal for applications that require a low noise environment using brushless fans.

3. Control and speed regulation: The speed of the DC brushless fan can be flexibly adjusted by the electronic controller. By changing the drive signal in the electronic controller, different air volume and pressure output can be achieved. This uses brushless fans with greater flexibility in meeting specific application requirements.

4. Application areas: DC brushless fans are widely used in various fields that require air volume and pressure control, including but not limited to:

1) Electronic equipment heat dissipation: such as heat dissipation of computers, servers, TVs and other equipment.

2) Industrial ventilation: used for ventilation and air circulation in factories, warehouses, office buildings, etc.

3) Automotive cooling: used for engine cooling and air conditioning systems in vehicles.

4) Medical equipment: such as bedside monitors, operating room equipment, etc.

5) Household appliances: such as air purifiers, vacuum cleaners, refrigerators, etc.

In general, DC brushless fans achieve efficient, silent and reliable air volume control through brushless DC motors. They are important heat dissipation and ventilation solutions in many fields.