Cooling fan according to the changes in the application environment, the fan used by the voltage can be divided into DC DC cooling fan and AC cooling fan, the latter derived from the EC cooling fan is now widely used, cooling fan in the electronic power, home appliances, machinery and equipment, and other industries have applications.

Then first analyze the difference between DC cooling fan and AC cooling fan from the working principle.

DC DC fan input is direct current, general DC voltage: 3V, 12V, 24V, 32V, 48V, 5V, 60V, 25.5V, 42V, 18V, 15V. operation principle is based on the Ampere right-hand rule, the conductor through the current, the surrounding magnetic field will be generated, if the conductor is placed in another fixed magnet, then the suction or repulsion will be generated, resulting in the movement of the object in DC. Inside the fan blades of a DC fan, a rubber magnetic strip is attached that has been previously charged with magnetism. Two sets of coils are wrapped around a silicon steel sheet, and a Hall sensor assembly is used as a synchronization detector to control a circuit that rotates the two sets of coils wrapped around the shaft. The silicon steel sheet generates a different magnetic field, which creates a repulsive force with the rubber magnet. When the repulsive force is greater than the static friction of the fan, the fan blades rotate naturally. The Hall sensor assembly provides a synchronized signal that allows the fan blades to run continuously, and the direction of rotation can be determined by Fleming's right-hand rule.

AC AC fan input is alternating current, general AC voltage: 100V, 110V, 120V, 220V, 230V, 240V, 115V, 230V, 380V, its operating principle: the power supply voltage will be positive and negative alternating current, you must rely on the circuit control, so that the two groups of coils work in turn in order to produce a different magnetic field, AC fan due to the power supply at a fixed frequency, so the silicon steel sheet produced AC fan because the power supply frequency is fixed, so the silicon steel sheet generated by the magnetic and change speed, determined by the power supply frequency, the higher the frequency of magnetic field switching speed faster, theoretically, the faster the speed will be, like a DC fan and the more the number of speed faster the same principle, but the frequency can not be too fast, too fast will cause difficulties in activation.

According to the working principle we can know that DC cooling fan rotor inside the permanent magnet strip and AC cooling fan does not have, and DC fan PCB board but AC fan is not, in the frame and blade, DC fan fan frame and fan blade are generally plastic material, generally made of plastic material, mainly PBT material, usually in the form of 30% of the application of the fiber, but AC fan fan fan frame is generally made of metal frame, there are Aluminum alloy and iron. In terms of parameters, DC fan power consumption is much smaller than AC, AC cooling fan can do a lot less speed than DC cooling fan, but the price is more expensive than DC cooling fan.