The function of the cooling fan is to make the air flow into the heat sink at a rated speed through the diversion.
From the perspective of power supply categories, cooling fans can be mainly divided into three categories: DC fans, AC fans, and EC fans.
DC fans and AC fans use DC power supply and AC power supply respectively, and the type of power supply can be distinguished by voltage
DC common 5V, 12V, 24V, 48V
AC common 110V, 220V
From the distinction of motor magnetic field switching, cooling fans can be further divided into two types, brushed and brushless, where brushes refer to carbon brushes
Main difference:
The brushed motor has short life, stable performance, low cost and high production efficiency
The stator winding connection method of brushless motor is similar to that of three-phase asynchronous motor, with long life, complex circuit, relatively high performance and high cost.
The structure of the fan
As can be seen from the figure below, the main operating structure of the cooling fan can be divided into rotor and stator
The rotor is composed of fan blades, shaft center, outer frame of magnetic ring, and magnetic ring
The stator consists of springs, bearings and motors
