As times and society advance, noise pollution has increasingly drawn public attention. Whether choosing living or working environments, or purchasing various devices and household appliances, people are now paying close attention to noise reduction. Since most charging station cabinets are located outdoors for charging purposes, they’re likely to be exposed to rain. So how does the cooling fan—the crucial component of the charging station’s cooling system—achieve waterproofing? Are there any special design features involved?
In a standard motor, the coil is wound around silicon steel laminations; you simply open the snap ring and remove the fan blade to expose the motor’s wiring diagram. However, for the cooling fans used in charging station cabinets, to protect the motor coil from being affected by rainwater, a great solution is to completely seal the entire coil. As a result, the coil itself becomes completely invisible—covered by a black insulating cap that prevents water from ever coming into contact with the coil.
Next, the PCB traces on the motor’s control board on the opposite side are sealed with waterproof adhesive, ensuring that the PCB won’t oxidize even if it comes into contact with water. After these two steps of motor waterproofing maintenance, the motor can withstand rainwater exposure without any issues, and the cooling fan can operate safely even when submerged in water. The motor’s waterproof rating reaches IPX7.
Many products require a silent fan for cooling purposes. So, the question is: How do you choose a cooling fan that offers both excellent heat dissipation and quiet operation?
1. Once we’ve confirmed the product’s size specifications—meaning the external dimensions cannot be changed—we recommend selecting a cooling fan with high airflow and high static pressure to make it quieter. Since fans with high airflow and high static pressure can achieve the same airflow rate while maintaining the same heat dissipation capacity, their rotational speed will be lower. For fans of the same specification, a lower rotational speed means fewer instances of friction with the air, resulting in reduced noise levels.
2. When the exact dimensions haven’t been finalized yet, we know that at the same rotational speed, a larger-sized cooling fan will definitely produce a greater airflow. Therefore, we can design the fan with slightly larger dimensions and operate it at a lower rotational speed—while maintaining the same airflow—to reduce noise.
3. When our requirements for heat dissipation aren’t particularly high, a very simple approach is to lower the rotational speed of the existing cooling fans—simply by using the same fan model at a reduced speed—to achieve quieter operation. To sum up, reducing the rotational speed is a crucial factor in enabling quiet fans to deliver their intended silence.
Common Misconceptions When Choosing Silent Radiators
Misconception 1: The larger the fan, the better its cooling performance.
When DIY enthusiasts are shopping for coolers and case fans, most consumers tend to go for products with larger fan sizes, believing that bigger fans naturally produce greater airflow. In the DIY community, this assumption often holds true—generally speaking, larger fans can indeed deliver greater airflow at the same rotational speed. However, under conditions where the airflow remains constant, larger fans typically offer superior noise reduction compared to smaller ones. As a result, many enthusiasts have a strong preference for large-sized fans. Yet, this belief is actually a significant misconception.
Misconception 2: Ball-bearing fans are always superior to oil-pressure fans.
Now that we’ve clarified the misconceptions about dimensions, let’s move on to discuss fans! This time, we’ll focus on one of the fan’s most critical design components—the “rotor bearing.” Typically, fans on the market fall into two main designs here: ball bearings and oil seals. Ball-bearing fans are relatively old; as even junior-high physics teaches us, rolling friction replaces sliding friction—a principle that’s quite straightforward. I won’t dwell on this topic further.
Misconception 3 when choosing a cooler: Small turbo-fan coolers have poor cooling performance.
We’ve already chatted about fans for two pages—now, on page three, let’s wrap things up and keep talking about all things related to fans. Even a tiny little fan holds quite a bit of “wisdom” within it.
Many consumers assume that “turbo” fans—those included with servers or mainstream graphics cards—are subpar and shouldn't even appear in the mass-market segment, since they’re said to have poor cooling performance and generate excessive noise. In fact, this is yet another common misconception. In reality, the thinner turbo fans currently available on the market consistently outperform their competitors in sales. These compact turbo fans boast higher rotational speeds and greater airflow, and their cooling design has shifted from top-mounted to side-mounted. Yet, many consumers still perceive these fans as having a major drawback: their extremely loud noise levels, often so intense that they become downright unbearable.