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In response to the growing market demand, our company is proud to announce the launch of its latest range of cooling fans, now boasting an impressive IP68 waterproof rating. This innovative product is designed to meet the needs of a variety of applications, ensuring reliability and performance even in the most challenging environments.

The cooling fan can be divided into two categories from the power supply mode: AC cooling fan and DC cooling fan. It is mainly used for ventilation and heat dissipation in computer equipment, household appliances, automotive equipment, mechanical equipment and other fields. The AC cooling fan is mainly used in industrial machinery and equipment, medical equipment and other large equipment; Dc cooling fans are generally used in computer electronics, household appliances and other small equipment. In addition to these, let's look at the main differences between AC cooling fans and DC cooling fans.

Shenzhen Fuqingda Electronic Technology Co., Ltd. announced its participation in the 2024 Guangzhou New Energy Power Supply Exhibition, the top event in the energy field. The company, known for its innovative cooling fan technology, will be showcasing a number of its latest products at the show. This event is an important platform for Fuqingda to showcase advanced technologies and establish connections with global industry leaders and potential customers.

When selecting a cooling fan, it is essential not only to consider your specific usage requirements but also to evaluate the following critical factors:

The speed control of the fan is generally controlled by PWM, the frequency is generally 25K to 50K, and the duty cycle is adjustable from 10% to 100%.

The input matching circuit of the PWM pin is shown in the figure below.

As can be seen from the figure, the input level inside the fan is actually matched to 3.3V, so by default the fan is running at full speed.

Regarding the PWM control of the fan, the author guessed that the input voltage of the fan should be adjusted by PWM control of the internal MOS switch, similar to the method of switching power supply to control the voltage value of the input to the motor, the higher the voltage, the faster the corresponding speed.

1, PWM speed control principle "Simplify 

the pwm speed control principle: a pwm chip generates a square wave pulse, and its pulse is connected to a triode level, if there is a high level on this level, the other poles of the triode are in the on-state, if it is low, the other poles are in the disconnected state.

If the duty cycle of the emitted square wave pulse signal is 50%, that is, the high level signal accounts for half the time of a cycle, then the triode is in the on-state for 1 1/2 time in a cycle.

With the on-time of the triode in one cycle, we can easily control the fan speed.

The FG (Frequency Generator) function of cooling fan, commonly referred to as Tach Out , primarily serves the purpose of outputting a square wave signal from within the fan.     The frequency of this signal is indicative of the fan's operational speed. For conventional four-pole fans, speed can be calculated as FG frequency multiplied by 30; thus, monitoring the FG signal allows for accurate determination of the fan's rotational speed.

After several months of hard work, our state-of-the-art automatic assembly line has been successfully installed and thoroughly debugged.  This cutting-edge production line represents a significant leap forward in our manufacturing capabilities, capable of cooling fan producing an impressive 10,000 fans per day.  This not only increases our production, but also saves a lot of labor, equivalent to the workload of five to six employees.

What is a brushless cooling fan motor?

The brushless DC cooling fan motor is composed of a motor body and a driver, and is a typical mechatronic product. Brushless motor refers to the motor without brush and commutator (or collector ring), also known as the commutatorless motor. As early as when the motor was born in the last century, the practical motor produced was a brushless form, that is, an AC squirrel cage asynchronous motor, which was widely used. However, asynchronous motors have many insurmountable defects, so that the development of motor technology is slow. Transistors were born in the middle of this century, so a brushless DC cooling fan motor that uses transistor commutation circuits instead of brushes and commutators came into being. 

DC cooling fan is an important cooling device in modern industry, which is widely used because of its simple structure, easy installation, good heat dissipation effect and long service life. So what is the structure and principle of DC cooling fan, and how to buy and install it reasonably?