At present, many fan brands emphasize DC fans when promoting products. What is the difference between a DC fan and an AC fan? Speaking of DC fans, we should first talk about the popular technology in the fan industry in recent years-natural wind mode. We used to use AC fans. The advantage is that the wind is large and the price is low. However, the exchange

Fans also have shortcomings, such as hard wind, loud noise, and easy headaches with direct blowing. In order to solve the shortcomings of traditional fan wind feeling hard and direct blowing headache, natural wind technology has appeared in the fan industry. The real natural wind outdoors feels soft and comfortable. We often say that the breeze blowing in the face may be this meaning. However, traditional fans use wind

The wind from the fan blades will have a strong whirlwind. When they blow directly on people, there will be a feeling of being hit in the face by the wind, which is very uncomfortable. Therefore, in the past, we used to blow the fan to the wall, let the wind reflect back, and then blow to the body, so that the wind will become more comfortable. So the fan blows off the natural wind

The key is to disperse the direct blowing and then blow it onto the person, which requires dual fan blades and a DC motor. A standard double-layer fan blade looks like this:

It can be seen that it is composed of two rings of fan blades inside and outside, and assembled on the fan, the blowing effect is as follows:

(Above: Single-fan blade fan: double-fan blade fan) The air supply effect is very obvious. The double-fan blade fan relies on the difference in wind speed between the inner and outer fan blades (the wind speed of the outer fan blades is fast, and the wind speed of the inner fan blades is slow). The two winds gather together, concentrate and disperse, and then continue to supply air, so that the air supply range is very wide and the wind feeling is softer. And pass

The unified single-blade fan has fast and straight wind speed, and will naturally feel uncomfortable when blowing to the body. However, this air supply effect cannot be achieved only by relying on double fan blades. Due to the traditional AC fan, the speed of the AC motor is particularly high, which is not suitable for double-fan blade fans. Once the motor speed is reduced, the working noise will be particularly large and the jitter will not be

often serious. Therefore, in order to restore the natural wind, a more stable and controllable DC brushless motor must be used.

Compared with AC motors, the biggest advantage of DC motors is the wide range of speed adjustment, low fan noise and high energy efficiency when working at low gears. Therefore, through the double-layer fan blade design, the fan can achieve the soft wind feeling of natural wind, and there will be no headache when blowing for a long time.