What is a DC brushless fan?
Category:
Industry Trends
Release time:
2020-06-29
DC brushless fan With the development of the electronic information industry, DC brushless fans have become widely used in many sectors. But what exactly is a DC brushless fan? I’m sure many customers would like to know its operating principle. So today, let’s talk about it!
The brushless DC motor consists of a motor body and a driver, making it a typical mechatronic product.
The stator windings of the motor are typically configured in a three-phase symmetrical star connection, making them very similar to those of a three-phase induction motor. The rotor of the motor is equipped with permanently magnetized magnets. To detect the polarity of the motor rotor, a position sensor is installed inside the motor. The driver is composed of power electronic devices and integrated circuits, among other components. Its functions include: receiving start, stop, and braking signals from the motor to control its starting, stopping, and braking; receiving signals from the position sensor and forward/reverse rotation signals to switch the power transistors in the inverter bridge on and off, thereby generating continuous torque; receiving speed commands and speed feedback signals to control and adjust the motor’s rotational speed; and providing protection and display functions, among others.
Since brushless DC motors operate in a self-controlled manner, they do not require additional starting windings on the rotor—as is the case with synchronous motors that start under heavy load when using variable-frequency speed control—and they also avoid oscillations and loss of synchronization during sudden load changes.
Depending on the type of bearing, brushless fans can be categorized into four types: 1. Single-ball-bearing brushless fans; 2. Rulon-bearing brushless fans; 3. Hydraulic-bearing brushless fans; and 4. Nano-bearing brushless fans. The standard dimensions of DC brushless fans typically include 6 cm, 7 cm, 8 cm, and 9 cm. A small number of coolers have begun using extra-large 12-cm diameter fans. Fan sizes and specifications are usually indicated by four-digit numbers.
Simply put, DC brushless fans are energy-efficient, have high power density, produce low operating noise, and are easy to maintain!
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