DC Brushless Cooling Fan: Efficient and Silent

Structure of DC Brushless Cooling Fans

It can be mainly divided into four major parts, rotor, stator, frame, and motor, along with some other miscellaneous components.

First, the fan rotor part

Includes fan blades, the core for generating airflow; the axis of the cooling fan, used to support and balance the rotation of the blades; rotor magnetic rings, permanent magnets key to switching rotational speed; and the magnetic ring outer frame to fix the magnetic ring.

Second, the fan stator part

Includes supporting springs that separate the bearings to balance the axis; bearings providing high-speed, low-friction, long-life rotation; retaining rings to fix and combine the rotating components; and the motor part which determines the rotation direction and speed.

Third, the outer frame of the cooling fan

Serves the purpose of supporting the fan motor and guiding the airflow.

Fourth, the motor part of the fan

Includes a circuit board that controls energy consumption and signal input/output, silicon steel sheets (i.e., stator magnets with wound coils) generating magnetic field switching, and silicon steel sheet upper and lower covers for fixing and insulation.

Principle of DC Brushless Cooling Fans

The designed pulse generator based on Hall elements features a simple structure and good performance. The harsh electromagnetic environment in locomotive electrical systems demands high anti-interference capabilities for products. The DC brushless cooling fan uses a brushless motor drive, eliminating electromagnetic interference, overcoming the disadvantages of brush commutation motors such as electromagnetic interference, high noise, and short mechanical lifespan. This makes it widely applicable in electronic and electrical scenarios requiring forced cooling. Wellsunfan is a DC fan supplier committed to providing customers with more high-quality product choices and services.

Characteristics of DC Brushless Cooling Fans

No brushes

The internal structure of the motor is special and does not require brushes for current commutation, thereby avoiding brush wear and noise issues.

Stable operation

Since there is no friction from brushes and commutators, the motor operates more smoothly.

Low noise

Compared to brushed motors, brushless motors have significantly lower noise levels.

Long lifespan

The lifespan of brushless motors is typically longer than brushed motors due to reduced mechanical wear.