What Is The Difference Between A DC Fan And An AC Fan?

1. Working principle:
The working principle of a DC cooling fan is to convert electrical energy into machinery through DC voltage and electromagnetic induction, which drives the rotation of the fan blades. By continuously switching between the coil and IC, the induction magnetic ring drives the rotation of the fan blades.
Working principle of an AC fan: Driven by an AC power source, the voltage will vary positively and negatively, and it does not rely on circuit control to generate a magnetic field. The frequency of the power supply is fixed, and the speed of magnetic pole change generated by the silicon steel sheet is determined by the power supply frequency. The higher the frequency, the faster the magnetic field switching speed, and theoretically, the faster the rotational speed. However, the frequency should not be too fast as it will cause difficulties in starting.
2. Structural composition:
The rotor of a DC cooling fan includes the DC cooling fan blades, which are the source of air flow and the fan shaft. They are used to support the balance of fan blade rotation, rotor magnetic rings, permanent magnets, and drive the magnetic stage to switch speed key, magnetic ring outer frame, and fixed magnetic rings. In addition, it also includes supporting springs, which are used to fix the entire rotating component and motor part of the nodule, produce the direction of rotation, and be able to adjust the size and speed of rotation. Its speed regulation performance is good and the control is simple.
The internal structure of an AC fan (single-phase) is composed of two coil windings, one is the starting winding, and these two windings are connected in series to form three points. The series connection point is the common end, and the end of the starting winding is the starting end. The end of the running winding is the running end. In addition, a starting capacitor is required, usually with a capacity between 12uf and a withstand voltage of 250V. There are two joints, one end is connected to the end of the starting winding, One end is connected to the end of the operating winding, forming a triangular shape. The power supply (without distinguishing between the live and neutral wires) is connected to the end of the operating winding (i.e. connected to one end of the capacitor), and the other end is connected to the common end. The grounding wire is connected to the motor casing.
3. Material characteristics:
DC cooling fan material: It is made of alloy material and can be used continuously for more than 50000 hours. The internal structure of the DC includes a transformer and main control board (including frequency conversion circuit, rectifier filter, amplification circuit, etc.) that are not affected by voltage fluctuations, so its service life is longer.
The internal structure of AC fans is mainly composed of transformers, and most of the materials used for AC fans are domestic discharge pins, usually tungsten or stainless steel. If the voltage fluctuates too much, it will affect the service life of the transformer.