The advantages and disadvantages of brushless cooling fans and brush cooling fans

The operating principle of the brushless cooling fan is to rely on changing the alternating frequency and waveform of the current wave input to the stator coil of the brushless DC cooling fan to form a magnetic field rotating around the geometric axis of the motor around the winding coil. This magnetic field drives the rotor on the When the permanent magnet rotates, the fan starts. The performance of the fan is related to the number of magnets, the strength of the magnetic flux, and the input voltage of the fan. It also has a lot to do with the control performance of the brushless DC cooling fan. Generally speaking, the structure of the brushless motor is relatively simple, and the real decision of its performance is the brushless electronic speed controller. A good electronic speed controller needs to have a single-chip control program design, circuit design, complex processing technology and other processes. Overall control, so the price is much higher than the brushed cooling fan. Comparison of brushless cooling fan and brush cooling fan A. Disadvantages of brush cooling fan 1. Large heat generation and short lifespan Due to the structure of the brush cooling fan, the contact resistance between the brush and the commutator is very large, resulting in the overall resistance of the motor Larger, easy to generate heat, and the permanent magnet is a thermal element. If the temperature is too high, the magnet will demagnetize, which will reduce the performance of the motor and affect the life of the brushed motor. 2. The friction is large and the loss is large. Old model friends have encountered this problem when playing with brushed cooling fans. That is, after using the motor for a period of time, the motor needs to be opened to clean the carbon brush of the motor, which is time-consuming and laborious, and the maintenance is not strong Yayu comes to a home cleaning. 3. Low efficiency and low output power. The heat problem of the brushed cooling fan mentioned above is largely because the current is done on the internal resistance of the motor, so the electrical energy is converted into heat to a large extent, so there is the output of the brushed cooling fan. The power is not high and the efficiency is not high. B. Advantages of brushless cooling fans 1. Long life and low maintenance costs. There are fewer brushes. The wear of brushless cooling fans is mainly on the bearings. From a mechanical point of view, brushless cooling fans are almost maintenance-free heat dissipation. When the fan is installed, you only need to do some dust removal maintenance when necessary. Comparing the previous and the next, we know the advantages of brushless motors over brushed motors, but everything is not absolute. The performance characteristics of brushless motors such as excellent low-speed torque performance and large torque are irreplaceable for brushless motors, but In terms of the ease of use of brushless motors, with the decreasing cost of brushless controllers and the development and market competition of brushless technologies at home and abroad, brushless power systems are in the stage of rapid development and popularization, which also greatly promotes The development of the model movement. 2. Brushless, low-interference brushless cooling fan removes the brush, the most direct change is that there is no electric spark generated when the brush cooling fan is running, which greatly reduces the interference of electric sparks to remote control radio equipment. 3. Low noise and smooth operation. The brushless cooling fan has no brushes, and the friction is greatly reduced during operation. The operation is smooth and the noise is much lower. This advantage is a huge support for the stability of the model. Welcome to the heat dissipation classroom and news center of the cooling fan manufacturer again. The copyright belongs to the cooling fan manufacturer and represents only personal opinions. Please do not reprint the whole article. Any violation will be held for legal responsibility. If you need to know more about the cooling fan manufacturer's product introduction, please Click Product Center