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Difference between DC Fan and AC Fan
- May 09, 2018 -

1.Working Principle:

DC cooling fan working principle: through DC voltage and electromagnetic induction, the electric energy is converted into mechanical to drive the fan blade to rotate, and the magnetic ring is continuously driven by the coil and the IC to rotate the fan blade.

The working principle of the AC fan: driven by the AC power supply, the voltage will be alternating positive and negative, and it does not rely on the control of the circuit to generate a magnetic field. The frequency of the power supply is fixed, and the speed of magnetic pole change produced by the silicon steel sheet is determined by the frequency of the power supply. The higher the frequency, the higher the switching speed of the magnetic field is, and the faster the speed will be theoretically. However, the frequency should not be too fast, too fast will cause start-up difficulties.

2. Structure:

The DC cooling fan rotor includes a DC cooling fan blade, which is a source of air flow and a fan shaft, and is used to support the rotation of the balance fan, the rotor magnetic ring, the permanent magnet, and the magnetic speed to switch the magnetic level, and the magnetic ring outer frame. Fixed magnetic ring. In addition, it also includes support springs, through which the nodules are fixed to rotate the entire component, the motor part, to produce the direction of rotation, and to be able to move the key to the speed of rotation. Its speed control performance is good and its control is simple.

The internal structure of the AC fan (single-phase) consists of two coil windings. One is the starting winding. The two windings are connected in series with each other. Thus three points are formed. The tandem point is the common terminal and the starting terminal is the starting terminal. The end of the winding is the running end. In addition, a starting capacitor is also needed. Normally the capacity is between 12uf and the withstand voltage is usually 250v. There are two joints, one end is connected to the end of the starting winding, and the other is the end of the running winding, forming a triangle type. The power supply (does not need to distinguish between the live wire and the neutral wire) is connected to the end of the running winding (that is, one end of the capacitor is also connected) and the other is connected to the common terminal. The grounding wire is connected to the motor housing.

3. Material Characteristics:

DC cooling fan material: alloy material, life can be used continuously for more than 50,000 hours, DC internal structure of the transformer and the main control board (including inverter circuit, rectifier filter, amplifier circuit, etc.) will not be affected by voltage fluctuations, so its Longer service life.

The internal structure of the AC fan is mainly transformer. Most of the AC fans use domestically produced discharge needles, which are generally tungsten needles or stainless steel materials. If the voltage is shaken too much, the service life of the transformer will be affected.