What are the differences between DC fans and AC fans?
Category:
Industry Trends
Release time:
2022-03-21
Currently, many fan brands emphasize DC fans when promoting their products. What’s the difference between DC fans and AC fans? When it comes to DC fans, we should first talk about a technology that has become popular in the fan industry in recent years—the natural wind mode. In the past, we used AC fans. Their advantages include strong airflow and low cost. However, AC...
Fans also have their drawbacks, such as a harsh wind feel, high noise levels, and the tendency to cause headaches when the wind blows directly on you. To address these shortcomings—namely, the harsh wind feel and direct-blow-induced headaches—the fan industry has introduced natural wind technology. A genuine natural breeze outdoors feels soft and comfortable. What we often refer to as a gentle breeze brushing against your face is probably exactly what this feels like. However, traditional fans use wind...
The wind blown by the fan blades creates a strong swirling breeze. When this wind directly hits a person, it feels like being slapped in the face—a sensation that’s quite uncomfortable. For this reason, in the past, we used to point the fans toward the wall, letting the wind bounce off the wall and then blow back onto us; this made the airflow much more comfortable. Thus, the key to achieving a natural-feeling breeze from a fan lies in...
The key is to disperse the direct airflow and then direct it toward a person—this requires dual-blade fans and a DC motor. A standard dual-layer fan blade looks like this:
As you can see, it consists of two concentric fan blades—inner and outer—and is assembled onto the fan. The airflow effect is as follows:
(Above: Single-blade fan vs. Dual-blade fan) The airflow effect is remarkably distinct. In the dual-blade fan, the difference in air velocity between the inner and outer blades—where the outer blades generate faster airflow and the inner blades produce slower airflow—causes the two streams of air to converge, concentrate, and then disperse evenly, thereby extending the airflow coverage significantly and delivering a softer, more gentle breeze. And the transmission...
A conventional single-blade fan delivers a fast, direct airflow that naturally feels uncomfortable when it hits the body. However, relying solely on dual blades cannot achieve this kind of airflow effect. Because traditional AC fans use AC motors that operate at exceptionally high speeds—speeds that are unsuitable for dual-blade fans—if the motor’s rotational speed is reduced, the operating noise will become particularly loud, and vibration will also be significant.
Often severe. Therefore, to restore natural airflow, it is essential to use a more stable and controllable DC brushless motor.
Compared to AC motors, the biggest advantage of DC motors is their wide adjustable speed range, low fan noise at low speeds, and high energy efficiency. Therefore, with a dual-layer fan blade design, the fan can deliver a gentle, natural breeze that won't cause headaches even after prolonged use.
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