DC cooling fan is a popular fan type among many fan types. What advantages can it have to be the preferred fan for so many enterprises? If you're struggling with which type of fan to buy, take a look at this article to make the right choice.
1. High power factor
The power factor of DC cooling fan is much higher than that of induction motor, because the excitation magnetic field of DC motor does not need the reactive current of power grid. DC motor can operate at 1 power factor, which is very beneficial to small power motor. Compared with induction motor, the motor not only has higher efficiency and power factor at rated load, but also has advantages in light load.
2. The inverter has low cost and low capacity
When the inverter continues to operate, the rated value refers to the peak value of the rectangular wave. The induction motor needs the sine wave current, and the DC motor needs the rectangular wave current.
When the inverter continues to operate, the current rating generally refers to the effective value of the sine wave. In order to maintain the control ability of inverter to motor current, there should be enough difference between inverter DC voltage and motor induced electromotive force.
In this case, if the peak current of DC motor and induction motor are equal, the power output of the former is 33% higher than that of the latter, that is to say, the same rectifier / inverter can drive a brushless DC motor 33% higher than that of the induction motor.
3. Low loss and high efficiency
At the same time, the permanent magnet DC motor works in synchronous mode because of the permanent magnet excitation.
The rotor core loss of induction motor is eliminated. These two aspects make the operation efficiency of permanent magnet DC motor far higher than that of induction motor, and the efficiency of small capacity motor is more obvious.
4. Good speed regulation performance and simple control
The speed control of DC fan is not only simple, but also has better speed regulation performance compared with frequency conversion speed regulation of induction motor.
Because of the above advantages, DC cooling fan has been indispensable in the use of electronic equipment. In the future, with the development of cross-border vertical and fine differentiation of electronic products, its application will be more and more widely.