Differences between AC fans and DC fans
- The working principle of AC/DC cooling fan
(1) The working principle of the DC cooling fan is according to the ampere theorem, the conductor is placed in another fixed magnetic field, and the conductor is energized to generate a new magnetic field. Because the same sex repulsion and opposites of the original, the internal and external magnetic field produces suction or repulsion, so that the object generates kinetic energy. Thus to achieve the purpose of external rotor operation. A magnetic rubber magnet is attached inside the blade of the DC cooling fan, and two groups of coils are wound on the shaft, and a Hall induction component is used as a synchronous detection device control circuit to make the two groups of coils wound on the shaft work in turn. Through the action of Hall, the silicon steel sheet produces different magnetic poles in turn, and this magnetic pole produces repulsion with the rubber magnet. When the repulsive force is greater than the static friction of the cooling fan, the fan blades will begin to operate.
(2) The working principle of the AC cooling fan is that through the direct power supply of AC, through a fixed AC frequency, the silicon steel blade generates a magnetic field switch, so that the cooling fan blade generates kinetic energy and rotates. The higher the power frequency, the faster the magnetic field switching speed, the higher the speed of the AC cooling fan.
- Ac/DC cooling fan parameter structure
The power consumption of DC cooling fans is much smaller than that of AC cooling fans, and the maximum speed that DC fans can achieve is also higher than AC fans. Secondly, the fan blades of the DC cooling fan have magnets, while the AC cooling fan does not; Dc cooling fan has PCB board, AC cooling fan does not; The appearance of AC and DC fans is also a little different, and the silicon steel sheet of AC is generally thicker than that of DC.
3, the price of AC/DC cooling fan
For cooling fans of the same size and brand, DC fans are generally more expensive than AC fans due to their more complex structure and principle. Because of the longer service life of ball bearings, the price will be higher than that of oil-bearing. Customers can choose the appropriate size and price of the cooling fan according to their own requirements.